An IT director is setting up new disaster recovery (DR) and High Availability (HA) policies for a company where limited downtime is critical. To meet corporate requirements, the director sets up two different data centers across the country that will stay current on data and applications. In the event of an outage, the company can immediately switch from one data center to another. Which of the following does this best describe
a) SSO (Single Sign-On)
b) VoIP Gateway
c) Layer 2
d) Hot site