Assume you have declared a method as follows:

private static double DisplayData$($string name $="$XX$",$ double amount $=10\mathrm{.}0)$

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

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

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

d$.$ All of these are legal