Which is NOT one of the three main e-commerce categories?

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Indicate whether the statement is true or false

A company has determined that its Recovery Time Objective (RTO) for critical systems is two hours. In order to facilitate a timely resumption of critical applications, the company should consider:

a. Data replication to servers in a hot site b. Data replication to servers in a warm site c. Clustered servers d. Disk to disk backup