Explanation:

- Section 9 of the Transfer of Property Act, 1882 allows that a transfer of property can be executed either orally or in writing, unless a specific law requires it to be in writing.

- Option 1: Also oral transfer - This option is correct as section 9 permits oral transfers.

- Option 2: Written transfer only - This is incorrect because section 9 does not restrict transfers to written form only.

- Option 3: Only (a) is correct - This points to Option 1 being correct, so it's true.

- Option 4: Only (b) is correct - This supports Option 2, which is false.

- Correct Answer: Option 1 - Also oral transfer