7. Which of the following is a valid header for a procedure that receives an integer followed by a number with a decimal place?

a. Private Sub GetFee(intBase As Integer, decRate As Decimal)

b. Private Sub GetFee(ByRef intBase As Integer, ByRef decRate As Decimal)

c. Private Sub GetFee(ByVal intBase As Integer, ByVal decRate As Decimal)

d. none of the above