What Are the Four Steps of the Sum-Of-Products Algorithm

What are the four steps of the sum-of-products algorithm?

A) compare for equality, subexpression construction using AND and NOT gates, subexpression addition using OR gates, subexpression multiplication
B) select input column, add inputs, multiply inputs, select output column
C) add subexpressions, multiply subexpressions, add gates, repeat as necessary
D) truth table construction, subexpression construction using AND and NOT gates, subexpression combination using OR gates, circuit diagram production