Which of the following functions accepts a parameter named dblSales and returns the commission to the calling statement? Assume that the commission should equal the sales multiplied by the commission rate. Use the following table as a guide to the calculation of the commission rate.
a.```
Function Calc(ByVal dblSales As Double, ByRef dblComm As Double)
Dim dblRate As Double
Select Case dblSales
Case Is < 2000
dblRate = .1
Case Is >= 2000
dblRate = .15
End Select
DblComm = dblRate
End Function
```
b.```
Function Calc(ByVal dblSales As Double) As Double
Dim dblRate, dblComm as Double
Select Case dblSales
Case Is < 2000
dblRate = .1
Case Is >= 2000
dblRate = .15
End Select
dblCommission = dblRate * dblSales
End Function
```
c.```
Function Calc(ByVal dblSales As Double) As Double
Dim dblRate As Double
Select Case dblSales
Case Is < 2000
dblRate = .1
Case Is >= 2000
dblRate = .15
End
c.```
Function Calc(ByVal dblSales As Double) As Double
Dim dblRate As Double
Select Case dblSales
Case Is < 2000
dblRate = .1
Case Is >= 2000
dblRate = .15
End Select
Return dblRate * dblSales
End Function
```
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