127. Anything done, or any promise made, for the benefit of the principal debtor may be a sufficient consideration to the surety for giving the guarantee.Illustrations (a) B requests A to sell and deliver to him goods on credit. A agrees to do so, provided C will guarantee the payment of the price of the goods. C promises to guarantee the payment in consideration of A's promise to deliver the goods. This is a sufficient consideration for C's promise. (b) A sells and delivers goods to B. C afterwards requests A to forbear to sue B for the debt for a year, and promises that if he does so, C will pay for them in defaults of payment by B. A agrees to forbear as requested. This is a sufficient consideration for C's promise. (c) A sells and delivers goods to B. C afterwards, without consideration, agrees to pay for them in default of B. The agreement is void.