Which statement correctly contrasts EIGRP and OSPF?

The correct statement is that EIGRP uses the Diffusing Update Algorithm (DUAL), which is a distance-vector algorithm, while OSPF uses Dijkstra's Shortest Path First (SPF) algorithm, a link-state algorithm. This fundamental difference defines how each protocol calculates and maintains routing tables. The second option is incorrect because it reverses the algorithms used by each protocol. The third option is incorrect because while EIGRP does support unequal-cost load balancing via the variance command, OSPF does not support unequal-cost load balancing by default or through a similar mechanism; it primarily performs equal-cost load balancing. The fourth option is incorrect because EIGRP was historically Cisco proprietary but is now an open standard, whereas OSPF has always been an open standard defined by the IETF.