Which of the following combinations of equations calculates the Cost of Goods Sold for a period in which sales and purchases were made?

i Opening Stock

ii Closing Stock

iii Purchases for the period

iv Goods available for sale

Question $8$ Select one:

a$.$

i $-$ ii

b$.$

iv $$ ii

c$.$

iv $-$ iii

d$.$

i $+$ iii $-$ ii $+$ iv

e$.$

None of the above