Select the sentence from the given options that conforms to Standard English Usage.
1
He did not lose sight either of the welfare of his army or of the doings of the enemy.
2
He did not lose sight either of the welfare of his army and of the doings of the enemy.
3
He did not lost sight either of the welfare of his army or the doings of the enemy.
4
He did not loose sight of either the welfare of his army or of the doing of the enemy.