Which of the following situations results in a routing loop?
A. when you have a single point of redistribution
B. when you use NAT translation on the edge of your network
C. when you implement contiguous IP routing blocks
D. when you implement noncontiguous IP routing blocks
E. when you have multiple points of redistribution
E
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/8606-redist.html
But, doing this increases the possibility of routing loops if there are multiple redistribution points and a router learns about the network with a better metric from the redistribution point than from the original source, as explained in the Administrative Distance section of this document.