Step 1: Understanding Cyber Appellate Tribunal (CAT).
The Cyber Appellate Tribunal is established under the Information Technology Act, 2000 to hear appeals against orders of adjudicating officers.
Step 2: Appointment process.
As per law, the Chairperson of CAT is appointed by the Central Government, but only after consultation with the Chief Justice of India to ensure judicial oversight.
Step 3: Elimination of wrong options.
- (B) State Government has no role.
- (C) Central Government alone cannot appoint without CJI's consultation.
- (D) Consultation with Controller of Certifying Authority is irrelevant.
Step 4: Conclusion.
Hence, the correct answer is (A).