Select each choice that could be a true statement for some context$-$free grammar G$.$ There

may be more than one correct choice.

$($a$)$ S $$

G

aBB

$($b$)$ aBBc $$

$$

G

baBc

$($c$)$ aBcB i

$$

G

abbc

$($d$)$ aBcB $$

G

acbbc