Triangle ABC is constructed with AB=6 cm, AC=5 cm and ∠A=50∘. Keeping AB fixed, the vertex C is erased. What is the locus of all possible positions of a new point X such that △ABX is congruent to the original △ABC?
(a) All points on a circle of radius 5 cm centred at A
(b) Exactly one point
(c) Exactly two points
(d) All points on both circles of radius 5 cm centred at A and B