Thomas wrote the expanded form of ( 5/2 )⁴ below.
5/2 + 5/2 + 5/2 + 5/2

Which statement is true?
a. Thomas wrote the expanded form correctly.
b. Thomas should have multiplied 5 times 4.
c. Thomas should have multiplied the base by itself four times.
d. Thomas should have multiplied the exponent by 5.