If the material is showing a hardness value of HRc 57, which of the following combination of load and indenter is used for the measurement?

• A. Load-100 kg, indenter-diamond cone
• B. Load-150 kg, indenter-diamond cone
• C. Load-100 kg, indenter-1.6 mm diameter ball
• D. Load-150 kg, indenter-1.6 mm diameter steel ball