You are on a cargo vessel carrying portable tanks of dangerous cargoes in bulk. Which statement is TRUE?

A
If the tanks are pumped out while remaining on board, each hose connection must have a minimum of three bolts.
B
If the tanks are off loaded, no more than two tanks may be lifted together in a hoist.
C
When transferring sulfuric acid, you must display a red flag by day whether at anchor or moored.
D
All electrical equipment within 10 feet horizontally must be explosion proof or intrinsically safe.
E