A vessel is constructed with a steel hull and an aluminum superstructure. Which statement is TRUE?

A
The aluminum will provide greater resistance to the spread of fire by conduction.
B
The aluminum structure is usually attached to a steel coaming by a method that insulates the two metals.
C
If the superstructure is stressed, an aluminum structure requires additional expansion joints to prevent fracture.
D
The steel at the area of the aluminum-to-steel connection must be closely checked for galvanic corrosion.
E