What solution enables a system administrator to move servers between two data centers without downtime?

VMware vSphere

Explanation:

VMware vSphere allows you to migrate live and/or move an entire running virtual machine from one physical server to another, with no downtime.

This is as a result of the virtual machine retaining its network connections and identity, which makes sure of a process of migration that is (almostl) not noticeable.

Cheera

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.

answer(true);