While inquiring into a complaint, Information Commissions have the power to:

The correct answer is D. all of them.

Information Commissions have the power to:

• Receive evidence on affidavit. This means that the Commission can accept evidence that is
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  sworn to in an affidavit, which is a written statement that is signed and sworn to
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  be true.
• Requisition record or copies thereof from any court or office. This means that the Commission can request records or copies of records from any court or office.
• Issue summons for examination of witnesses or documents. This means that the Commission can issue a summons to a witness to appear before the Commission to give evidence or to produce documents.

These powers are necessary to enable the Commission to conduct a thorough investigation into complaints and to make a fair and just decision.