To answer this question, you need to understand the basic commands used in the vi editor.

Option A) s - This option is incorrect because the s command is used to substitute characters. It deletes the character under the cursor and enters insert mode.

Option B) S - This option is incorrect because the S command is used to delete the current line and enter insert mode at the beginning of the line.

Option C) a - This option is incorrect because the a command is used to append text after the cursor. It enters insert mode after the current character.

Option D) i - This option is correct because the i command is used to insert text to the left of the cursor. It enters insert mode before the current character.

Therefore, the correct answer is option D) i.

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• Wrong explanation

To answer this question, you need to understand the options that can be used with the ps command.

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

Option A) -4 - This option is incorrect because -4 is not a valid option for the ps command.

Option B) -f - This option is correct because the -f option is used with the ps command to provide full-format listing. It displays additional information about each process, including the command line of the process being run.

Option C) -1 - This option is incorrect because -1 is not a valid option for the ps command.

Option D) -5 - This option is incorrect because -5 is not a valid option for the ps command.

The correct answer is Option B) -f. This option is correct because it provides a full-format listing, including the command line of the process being run.

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• Wrong explanation