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Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?

Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?

A. Cobalt, chromium & tungsten
B. Cobalt, chromium & nickel
C. Molybdenum, tungsten & chromium
D. Cobalt, zirconium & molybdenum