What is the formula for calculating the cost of goods sold (CMV) in the perpetual inventory method? I - CMV = Initial Stock + Purchases - Final St...

What is the formula for calculating the cost of goods sold (CMV) in the perpetual inventory method?

I - CMV = Initial Stock + Purchases - Final Stock
II - CMV = Final Stock - Purchases + Initial Stock
III - CMV = Purchases - Initial Stock + Final Stock
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I and III are correct.