Answer is A is correct. Best evidence rule deals with documentary evidence, whereby only document to be produced in evidence when there is evidence in written form as per Section 91 and 92 of the Act. Therefore option (a) is the correct answer.

Answer is C is correct. Electronic evidence was incorporated in the Indian Evidence Act as a part of documentary evidence through Act 21 of 2000. Therefore option (c) is the correct answer.

Answer is C is correct. Doctrine of estoppel which is dealt under Section 115 of the Act was laid in the case of Pickard v. Sears. Therefore option (c) is the correct answer.

Answer is D is correct. ‘Alibi’ means somewhere else, to prove this the burden lays on the accused as this a defence available to him to get away with crime. Therefore option (d) is the correct answer.

Answer is A is correct. Section 105 applies only to criminal trials. When a person is accused of any offence, the burden of proving the existence of circumstances bringing the case within any of the General Exceptions in the Indian Penal Code or within any special exception or proviso contained in any other part of the same Code, or in any law defining the offence, is upon him, and the Court shall presume the absence of such circumstances. Therefore option (a) is the correct answer.