Refer to the exhibit. Which two statements about the network environment of router R1 must be true? (Choose two.)

The default EIGRP administrative distance for internal routes is 90; 170 is the default for external EIGRP routes, so assuming it was manually changed without further context is not necessarily true.

If the router has learned 20 different network masks within the 10.0.0.0/8 network, it indicates the use of Variable Length Subnet Masking (VLSM) or extensive subnetting, where the router is aware of diverse subnet sizes within that major network.

Equal-cost load balancing suggests that ten EIGRP routes to a particular destination have identical metrics, allowing traffic to be distributed across both Te0/1/0.100 and Te0/2/0.100 interfaces to fully utilize available bandwidth.

While 170 is the AD for external EIGRP, the statement suggests a single network, whereas other options point to more specific and complex routing details likely present in the exhibit.

A static default route is typically configured manually and would be indicated by 'S*' in the routing table, which is unrelated to EIGRP route learning.