This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to create a corn snake vivarium
Choose either a glass or plastic vivarium.
Plastic cages are sturdier and last longer than glass cages. They have grates on each side for airflow, and they can be heated from below using heating pads.

Choose from:
(a). Plastic vivariums, however, have very limited air flow, which can damage the vivarium during the heating cycle. Glass cages are usually made of steel, stone, and porcelain.
(b). Glass vivariums have a single flue near the bottom for ventilation. Feed the snake your corn snake until he is 12 to 14 months old.
(c). Alternatively, you can buy specially made glass reptile enclosures, or use a 40-gallon (151.42 l) aquariums. Make sure that you choose one made for snakes so your corn snake doesn't escape.
(d). However, glass vivariums are less prone to ash build-up than glass cages, and are in more basic condition. Glass cages should have ventilation holes near the top to keep dust and debris from flying in as the snake moves through them.
The answer is:
(c).