The safety stopper that prevents the anchor cable from running free if the cable jumps the wildcat is the（）.

A.right at the bow
B.one-third the length of the vessel from the bow
C.one-half the length of the vessel from the bow
D.two-thirds the length of the vessel from the bow

A.force the warped，bulged，or deformed sections back into place
B.support and hold the area in the damaged position
C.withstand subsequent additional damage
D.make a watertight seal at the damaged area

A.transport tubulars from the pipe racks to the derrick floor
B.maintain constant tension on the marine riser
C.store and secure the excess drill line
D.lower and hoist the drill string into and out of the drilled hole