A continuous watertight bulkhead on a MODU is normally also a(n) __________.

Correct Answer: Option D — structural bulkhead

Continuous watertight bulkheads on Mobile Offshore Drilling Units serve critical primary stress-bearing and subdivision functions. Under 46 CFR standards, these boundaries act as structural bulkheads to maintain hull integrity, compartmentalization, and global strength against wave-induced bending moments.