17.
The answer is: C
Explanation
The correct option is C: Only in High Court.
According to Section 62 of the IT Act, 2000, a person aggrieved by the decision or order of the Cyber Appellate Tribunal, may file an appeal with the high court within sixty days of receiving notification of the Tribunal’s decision or order on any question of fact or law arising out of such order. The other options are incorrect because the IT Act does not provide for any other forum for appealing against the Cyber Appellate Tribunal's order.