D
Generally, a cold site is contracted for a longer period at a lower cost. Since it requires more time to make a cold site operational, it is generally used for noncritical applications. A warm site is generally available at a medium cost, requires less time to become operational and is suitable for sensitive operations. A mobile site is a vehicle ready with all necessary computer equipment that can be moved to any cold or warm site depending upon the need. The need for a mobile site depends upon the scale of operations. A hot site is contracted for a shorter time period at a higher cost and is better suited for recovery of vital and critical applications.