Why do SNMP counters often show different numbers than Cisco IOS CLI show commands?

Why do SNMP counters often show different numbers than Cisco IOS CLI show commands?

A.
The counter output from a CLI show command cannot be reset on interfaces.

B.
SNMP counters use SNMPv3 values, whereas CLI show commands use SNMPv2 values

C.
SNMP uses 64-bit counters, whereas CLI show commands use 32-bit counters.

D.
The only way to reset the SNMP counters is to reload the box.