Identify local and global variables in the following script:

$>>>$ def myfunc$($

$>>>,x=10$;

$>>>y=20$;

a$.$ Both $x$ and $y$ are local variables.

b$.$ Both $x$ and $y$ are global variables.

c$.x$ is the global variable, $y$ is the local variable.

d$.x$ is the local variable, $y$ is the global variable.