How many addresses need to be put into the pool to ensure an even number of IP addresses per node after failover distribution should a node fail?

A company has an Isilon cluster on which they want to configure dynamic pools. The cluster consists of 5 nodes. The pool will consist of one 1Gbps Ethernet external interface on each of the nodes. Because the address space is limited at the company’s site, they will need to implement dynamic pools using a minimum number of addresses.
If the company puts all interfaces in one pool and sets it to dynamic with round robin failover, how many addresses need to be put into the pool to ensure an even number of IP addresses per node after failover distribution should a node fail?
A. 4
B. 8
C. 15
D. 20

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