A perfectly straight portion of a uniform rope has mass M and length L. At end A of the segment, the tension in the rope is TA; at end B it is TB>TA. The tension in the rope at a distance L/5 from end A is
(a) TB−TA; (b) (TA+TB)/5;
(c) (4TA+TB)/5; (d) (TA−TB)/5.