Section 63(4) and its Schedule can be tested by checking each of the three specific features one at a time, and then seeing whether anything is left over as "not stated."
Checking feature one:
The dual signature of the person in charge of the device and an expert, in the Schedule's prescribed format, is written into the certification requirement, so it is present.
Checking feature two:
The expert's qualification is called for as part of establishing the reliability of the certificate, so it too is present.
Checking feature three:
The hash value requirement is one of the technical details the prescribed Schedule form calls for, so it is present as well.
Conclusion:
Since every one of the three specific features checks out as genuinely part of Section 63(4), there is no remaining feature that qualifies as "not stated," which leaves the residual option as the only correct choice.
Section 63(4) was drafted to tighten up how electronic evidence gets authenticated, closing gaps that existed under the older law by demanding more detail and more accountability in the certificate. Testing each option against that tightening purpose shows why none of them describes something left out.
Because every listed feature actually advances the provision's purpose of stronger, more reliable certification, none of them can be the one that is missing.
Therefore, the correct answer is None of the above.