The correct answer is: Armature winding.
The armature winding is the part of a DC motor that carries the current that produces the magnetic field that rotates the motor. The armature winding is made of copper wire that is wound around a laminated iron core. The copper wire is insulated from the iron core to prevent short circuits. The armature winding is the part of the motor that is most likely to overheat, so it is important to keep it cool.
The slip rings are used to connect the armature winding to the external circuit. The slip rings are made of copper and are insulated from the shaft of the motor. The slip rings are in contact with brushes that are also made of copper. The brushes are held in place by brush holders. The brushes are what carry the current from the external circuit to the armature winding.
The commutator is a device that is used to reverse the current in the armature winding as the motor rotates. The commutator is made of copper segments that are insulated from each other. The commutator is in contact with the brushes. The brushes carry the current from the external circuit to the armature winding. The commutator is what reverses the current in the armature winding as the motor rotates.
The field winding is the part of the motor that produces the magnetic field that rotates the motor. The field winding is made of copper wire that is wound around a laminated iron core. The copper wire is insulated from the iron core to prevent short circuits. The field winding is the part of the motor that is least likely to overheat.
Therefore, the armature winding is the part of a DC motor that can sustain the maximum temperature rise.