For an induction motor, Which of the following statements are correct?

[answerhappygod]

(i) squirrel cage type is simpler and more economical in construction
(ii) wound rotor type requires less maintenance
(iii) squirrel cage type is more rugged and requires less maintenance
(iv) no external resistance can be inserted in the rotor circuit of squirrel cage induction motor
(v) no external resistance can be inserted in the rotor circuit of a wound rotor induction motor
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a) (ii), (v), (iii)
b) (ii), (iii), (v)
c) (i), (iii), (iv)
d) (i), (ii), (iv)