$($a$)$ Write a function named processNumbers$()$ with a variable parameter list that can process numbers in the parameter list. The function processes the arguments and returns the largest number passed to it$.$

For example, processNumbers$("$True$","1234",$ "False", $"56")$; should return $1234.(10$ marks$)$

Hint: The is$\_$numeric$()$ function in PHP determines whether a variable is a number or a numeric string and returns true $(1)$ if it is; otherwise, it returns false or nothing.

$($b$)$ Write the changes required to modify the function in $($a$)$ to be an anonymous function. You do not need to rewrite the entire function; just indicate clearly the changes required. $(3$ marks$)$

$($c$)$ Write code to demonstrate how to invoke the anonymous function in $($b$).(2$ marks$)$