B', 'C' and 'D' never saw 'A' writing. But they give their opinion about the handwriting of 'A'. The opinion of which one is relevant?

The privilege to withhold the documents/information under the administrative law is enacted in which of the following Sections of the Evidence Act?

Section 27 of the Indian Evidence Act, 1872, permits the use of discovery evidence, which lays down strictly as to how much of the information contained in the statement of the accused is made admissible. Which one of the following information is relevant under this Section?