What is the result of the following PHP code?

$age $=18$;

if$($$age $>15)\{$

print$("$you are older than $15")$;

$\}$ else if $($$age $>16)\{$

print$("$you are older than $16")$;

$\}$ else if $($$age $>20)\{$

print$("$you are older than $20")$;

$\}$ else $\{$

print$("$you are $15$ or less"$)$;

$\}$

a$.$ It prints "you are older than $15"$

b$.$ It prints "you are older than $16"$

c$.$ It prints "you are older than $20"$

d$.$ It prints "you are $15$ or less"

e$.$ It prints "you are older than $15"$ AND "you are older than $16"$

f$.$ It prints nothing