d=6√t is the equation for diameter (d) and thickness (t) when _________

• A. d and t are in millimeters
• B. d and t are in inches
• C. d is taken from standard chart and t is calculated
• D. and thickness (t) when _________a) d and t are in millimetersb) d and t are in inchesc) d is taken from standard chart and t is calculatedd) t is taken from standard chart and d is calculated