Consider the following statements regarding Commutation in DC Machines:1.Commutation is the process by which alternating current in armature conductors is converted into direct current at the terminals.2.Poor commutation results in sparking at the brushes and can damage the commutator surface.3.Brush shifting and use of interpoles help in improving commutation performance.4.Proper commutation is essential for efficient and sparkless operation of DC machines.Which of the above statements is/are correct?