The given sentence contains an error. Select the option that correctly rectifies the error.
That career competition was the difficultest exam he had ever given.
1
That career competition was the difficultest exam than any he had ever given.
2
That career competition was the most difficult exam than any he had ever given.
3
That career competition was the most difficultest exam he had ever given.
4
That career competition was the most difficult exam he had ever given.