Hardness and tensile strength in austenitic stainless steel can be increased by

Question

Consider the following treatments:

         1. Normalising                2. Hardening

         3. Martempering             4. Old working

         Hardness and tensile strength in austenitic stainless steel can be increased by

         (a) 1,2 and 3                   (b) 1 and 3

         (c) 2 and 4                      (d) only 4