A useful way to sort through this provision is to separate what Section 63(4) is trying to authenticate from what it is not trying to regulate at all.
Since the provision is built entirely around authenticating the record rather than credentialing the expert, the requirement not found in Section 63(4) is the qualification of an expert, which is the correct answer.
Since Section 63 of the Bharatiya Sakshya Adhiniyam closely carries forward the earlier certificate requirement for electronic records from the predecessor evidence law, comparing the two can also confirm what the current provision does and does not require.
Comparing the current provision with its historical structure confirms that the qualification of an expert is the one item never required, making it the correct answer to what is not stated in Section 63(4).