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Identify the correct sentence from the four sentences given below. If none of them are are correct choose option "E"

The best way for an IT expert to protoect data is to periodically back it in a pre-formatted disc.

The best way for an IT expert to protect data is if it is quickly backed in a pre-formatted disc.

The best way for an IT expert to protect data is for it to be backed periodically in a pre-formatted disc.

The best way for an IT expert to protect data is to have them periodically backed in a pre-formatted disc.