A surety is exonerated:
1. In like manner with a guarantor.
2. To the extent to which he is prejudiced by any act of the creditor which would naturally prove injurious to the remedies of the surety or inconsistent with his rights, or which lessens his security; or, 3. To the extent to which he is prejudiced by an omission of the creditor to do anything, when required by the surety, which it is his duty to do.