To understand which mode of opening is required when the REWRITE statement is used, let's go through each option:

Option A) INPUT - This option is incorrect because the INPUT mode is used for reading data from a file, not for rewriting existing data.

Option B) OUTPUT - This option is incorrect because the OUTPUT mode is used for writing data to a file, not for rewriting existing data.

Option C) I-O - This option is correct because the I-O mode (Input-Output) is used when you want to both read and rewrite existing data in a file. The REWRITE statement is used specifically to rewrite existing records within a file.

Option D) EXTEND - This option is incorrect because the EXTEND mode is used to add new records to the end of a file, not for rewriting existing data.

Option E) All of the above - This option is incorrect because not all of the above options are required when using the REWRITE statement. Only the I-O mode is required.

Option F) None of the above - This option is incorrect because the correct answer is option C, I-O.

Therefore, the correct answer is option C, I-O. This option is correct because the I-O mode is required when using the REWRITE statement to rewrite existing records in a file.

• Thanks
• Wrong explanation

To answer this question, you need to understand the concept of a PATHMON in a pathway system.

A PATHMON (pathway monitor) is a device or software that monitors and manages the performance and availability of a pathway system. It ensures that the pathway is functioning properly and can detect any issues or failures.

In a single pathway system, there is typically only one PATHMON. This single PATHMON is responsible for monitoring and managing the entire pathway system.

Therefore, the statement "There can be many PATHMONs for a single pathway system" is false. The correct answer is B) False.

• Thanks
• Wrong explanation