When do EIGRP routers send full updates?

A) Upon startup
B) When a router receives a TCN
C) When an ASBR injects routes into the AS
D) Every 60 minutes
E) When a router recalculates the SPF tree

A
Explanation: A) The only time EIGRP sends a full update is when the protocol initially initializes; often, this is when the device comes up (startup).