From the list below, select three metallurgical/processing techniques that are employed to enhance the creep resistance of metal alloys.

(a) polishing the surface to remove stress amplification sites
(b) hardening (carburizing, nitriding) or shot peening
(c) anneal the metal alloy
(d) increasing the grain size or producing a grain structure with a preferred orientation.
(e) solid solution alloying
(f) dispersion strengthening by using an insoluble second phase
(g) unidirectional solidification of alloys