$8.$ Which of the following is a valid function definition statement?

$($a$)$ function cube $($double x$)$

$($b$)$ double cube $($double x$)$

$($c$)$ double cube $($x$)$

$($d$)$ cube $($double x$)$

$9.$ In a function call, the function arguments are separated by

$($a$)$ commas.

$($b$)$ semicolons.

$($c$)$ colons.

$($d$)$ spaces.

$10.$ The definition of the statements in which an identifier is known $($or can be used$)$ is its

$($a$)$ global.

$($b$)$ local.

$($c$)$ static.

$($d$)$ scope.