Surface extensions shall be permitted to be made from the cover of a box where the cover is designed so it is unlikely to fall off or be removed if its securing means becomes loose. The wiring method shall be $\_\_\_\_\_\_\_$ for an approved length that permits removal of the cover.

Question $28$Select one:

a$.$

flexible

b$.$

a nonmetallic raceway

c$.$

a ridged raceway

d$.$

al

l of the above