According to Section 2(31) of the Bharatiya Nyaya Sanhita, which of the following is considered a "valuable security"? 

The correct answer is Option 3.

Key PointsSection 2 (31) “valuable security” of the Bharatiya Nyaya Sanhita, means a document which is, or purports to be, a document whereby any legal right is created, extended, transferred, restricted, extinguished or released, or whereby any person acknowledges that he lies under legal liability, or has not a certain legal right. 
Illustration.
A writes his name on the back of a bill of exchange. As the effect of this endorsement is to transfer the right to the bill to any person who may become the lawful holder of it, the endorsement is a “valuable security”;