The composition of some of the alloy steels are as under1. 18W4Cr1V2. 12M01W4Cr1V3. 5M06W4Cr2V4. 18W8Cr1VThe composition of commonly used high-speed steels would include

• A. 1 and 2
• B. 2 and 3
• C. 1 and 4
• D. 1 and 3