218. In the illustrated switchboard, what is the purpose of the device labeled «AM Sel

it allows the instantaneous difference between individual three phase legs to be displayed on the ammeter
it allows the instantaneous average of the three phase legs of alternator current to be displayed on the ammeter
it allows the instantaneous difference between the average of the three phase legs of both alternators to be compared
it allows the individual three phase legs of alternator current to be displayed on the ammeter by selective switching

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