As per section……, the liability of a surety is co-extensive with that of the principal debtor unless the contract provides to the contrary.
127
128
129
126
As per section 128, the liability of a surety is co-extensive with that of the principal debtor unless the contract provides to the contrary. As soon as the Principal Debtor makes any default in the payment of the debt, the surety becomes liable. Hence correct option is b.