In a network with dynamic mutual redistribution between multiple OSPFv2 and EIGRP boundaries, which two mechanisms avoid suboptimal routing? (Choose two)

Route filtering at redistribution boundaries explicitly blocks routes learned from one routing domain from being redistributed back into it, directly breaking the feedback loops that cause suboptimal routing and route oscillation.

AD manipulation can influence local route preference but does not prevent routes from being redistributed and re-advertised in loops across multiple redistribution boundaries.

EIGRP process IDs are locally significant and have no influence on preventing suboptimal routing or loops during mutual redistribution with OSPF.

Distinguishing OSPF external route types (E1 vs E2) affects metric calculation behavior but is not a recognized mechanism for preventing suboptimal routing in mutual redistribution scenarios.

Route tagging marks redistributed routes with a unique identifier so that downstream redistribution policies can recognize and discard routes that have already crossed a boundary, preventing them from looping back and creating suboptimal or unstable paths.