Explanation:

- The executing court's primary role is to enforce the decree, not to change its content.

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- Option 1: Can modify the terms of the decree

- Incorrect. The executing court cannot modify the decree's terms.

- Option 2: Can vary the term of the decree

- Incorrect. The executing court cannot vary (change) the duration or details of the decree.

- Option 3: Can modify and vary the terms of the decree

- Incorrect. The court has no power to either modify or vary the decree while executing it.

- Option 4: Can neither modify nor vary the terms of the decree

- Correct. The executing court cannot change, alter, or modify the decree. It only enforces what has been ordered.