What is the major difference between the two possible Cisco IM and presence high-availability modes?

What is the major difference between the two possible Cisco IM and presence high-availability modes?
A . Balanced mode provides user load balancing and user failover only for manually generated failovers. Active/standby made provides an unconfigured standby node in the event of an outage, but it does not provide load balancing.
B . Balanced mode provides user load balancing and user failover in the event of an outage. Active/standby mode provides an always on standby node in the event of an outage, but it does not provide load balancing.
C . Balanced mode does not provide user load balancing, but it provides user failover in the event of an outage. Active/standby mode provides an always on standby node in the event of an outage, but is does not provide load balancing.
D . Balanced mode provides user load failover in the event of an outage. Active/standby mode provides an always on standby node in the event of an outage, and is also provides load balancing.

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Answer: B