$1.$ Which is the wrong $($or the least correct$)$ statement?

$($a$)$ The header of a function defined in a package specification provides all the information that an invoker needs.

$($b$)$ To access a function defined in a package, the invoker should incite the function name

with its package name, such as package$\_$name.function$\_$name.

$($c$)$ If there is a function declared in the specification of a package, then the whole definition

of this function $($header and body$)$ must be provided in the executable section of a package

body.

$($d$)$ The variables declared in the package speciation are public to the invoking program.

$($e$)$ The variables declared in the package body are local to the package body program, invoking program cannot see these variables.