To answer this question, you need to know the shortcut key to activate the menu bar in a program.

Let's go through each option to understand why it is correct or incorrect:

Option A) F1 - This option is incorrect because the F1 key is typically used for accessing Help files or documentation in a program, not for activating the menu bar.

Option B) F10 - This option is correct. Pressing the F10 key on your keyboard usually activates the menu bar in a program. This allows you to navigate through the different menus and access various options.

Option C) F3 - This option is incorrect. The F3 key is commonly used for searching or finding text within a program, not for activating the menu bar.

Option D) None - This option is incorrect. There is a shortcut key to activate the menu bar in a program, which is the F10 key.

The correct answer is B) F10. This option is correct because pressing the F10 key usually activates the menu bar in a program, allowing you to navigate through the menus and access different options.

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• Wrong explanation

To answer this question, we need to understand how variable assignment and echoing work in shell scripting.

Option A) tree=maple; export tree; sh -c "echo $tree" - This option is correct. Here, the variable "tree" is assigned the value "maple", then it is exported using the "export" command. The "sh -c" command is used to run the following command in a subshell. The "echo $tree" command is used to print the value of the variable "tree", which is "maple".

Option B) tree=maple; export $tree; sh -c "echo $tree" - This option is incorrect. In this case, the variable "tree" is assigned the value "maple", but when exporting the variable using "export $tree", the shell will interpret it as exporting the value of the variable "maple" (which is empty). Therefore, the echoed value will be empty.

Option C) $tree=maple; echo $tree - This option is incorrect. When assigning the value "maple" to the variable "$tree", the shell will interpret it as trying to assign the value of a variable named "maple" to the variable "$tree", which is not what we want. Therefore, this option will result in an error.

Option D) export tree = maple; echo $tree - This option is incorrect. When exporting a variable, we should not include spaces around the "=" sign. So, the correct syntax should be "export tree=maple". Additionally, the echo command should be used after the export command to print the value of the variable. Therefore, this option will result in an error.

The correct answer is Option A. This option correctly assigns the value "maple" to the variable "tree", exports it, and then prints the value of the variable using the echo command.

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• Wrong explanation