Which is the equation used to calculate the required fastener torque as a function of the desired preload (Fᵢ) and bolt size (d)?
a) ( T = F_i ⋅ d/2 )
b) ( T = F_i ⋅ d/3 )
c) ( T = F_i ⋅ d/4 )
d) ( T = F_i ⋅ d/5 )