Which vessel(s) is(are) required to comply with the "Vessel Bridge-to-Bridge Radiotelephone Regulations" while navigating?

A
Towing vessels 25 feet or less in length, engaged in towing operations
B
Passenger vessel 50 gross tons or less, carrying passengers for hire
C
Dredges engaged in operations likely to restrict navigation of other vessels in or near a channel or fairway
D
An intermittently manned floating plant under the control of a dredge
E