What are the advantages of providing the field winding on rotor and armature winding on the stator?

What are the advantages of providing the field winding on rotor and armature winding on the stator? Correct Answer all of the mentioned

If the armature winding is on the stator, only two slip rings are required which implies less losses, more efficiency and more economy. Also, stationary armature winding can be cooled more efficiently.
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