86.
The answer is: A
Explanation
The correct option is A: can be used as substantive evidence without being formally proved
The confession recorded under section 164 can be used as substantive evidence, without being formally proved. Record of such confession is admissible as evidence. Entire confession must be brought on record. The Court must carefully weigh it with other evidence. The Court may reject part of it.. Where the confession was found rejected, the convictions based on them could not be sustained.