Question: A program contains the statement tax = calcTax(sales);. The tax and sales variables have the double data type. Which of the following is a valid

A program contains the statement tax = calcTax(sales);. The tax and sales variables have the double data type. Which of the following is a valid function header for the calcTax function?

a. calcTax(double sales);

b. double calcTax(salesAmount)

c. double calcTax(double salesAmount)

d. double calcTax(int sales);

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