When one of a method's parameters is optional, it means that

a$.$ no arguments are required in a call to the method

b$.$ a default value will be assigned to the parameter if no argument is sent for it

c$.$ a default value will override any argument value sent to it

d$.$ you are not required to use the parameter within the method body

$345$

Which of the following is an illegal method declaration?

a$.$ private static void CreateStatement$($int acctNum, double balance $=0\mathrm{.}0)$

b$.$ private static void CreateStatement$($int acctNum $=0,$ double balance$)$

c$.$ private static void CreateStatement$($int acctNum $=0,$ double balance $=0)$

d$.$ All of these are legal.

Assume you have declared a method as follows: private static double ComputeBil$1($int acct, double price, double discount $=0)$ Which of the following is a legal method call?

a$.$ ComputeBi$11()$;

c$.$ ComputeBi$11(1001,200\mathrm{.}00)$;

b$.$ ComputeBil$1(1001)$;

d$.$ None of the above is legal.

Assume you have declared a method as follows: private static double CalculateDiscount$($int acct $=0,$ double price $=0,$ double discount $=0)$ Which of the following is a legal method call?

a$.$ CalculateDiscount$()$;

b$.$ CalculateDiscount $(200\mathrm{.}00)$;

c$.$ CalculateDiscount $(3000\mathrm{.}00,0\mathrm{.}02)$;

d$.$ None of the above is legal.

Assume you have declared a method as follows: private static double DisplayData$($string name $="xx",$ double amount $=10\mathrm{.}0)$

Which of the following is an illegal method call?

a$.$ DisplayData$($name : "Albert"$)$;

b$.$ DisplayData$($amount : $200,$ name : "Albert"$)$;

c$.$ DisplayData$($amount : $900\mathrm{.}00)$;

d$.$ All of these are legal.