"Bond" includes—

(a) any instrument whereby a person obliges himself to pay money to another, on condition that the obligation shall be void if a specified act is performed, or is not performed, as the case may be;

(b) any instrument attested by a witness and not payable to order or bearer, whereby a person obliges himself to pay money to another; and

(c) any instrument so attested whereby a person obliges himself to deliver grain or other agricultural produce to another.