What is the unit of pressure commonly used in the industry? I - Atmosphere (atm). II - Millimeter of mercury (mmHg). III - Kilogram-force per squa...

What is the unit of pressure commonly used in the industry?

I - Atmosphere (atm).
II - Millimeter of mercury (mmHg).
III - Kilogram-force per square centimeter (kgf/cm²).
IV - Bar (bar).
V - Pound per square inch (psi).
VI - Meter of water column (mca).
a) Only I, II, and III are correct.
b) Only IV, V, and VI are correct.
c) All are correct.
d) None are correct.