Refer to the exhibit. What is the most appropriate summarization for these routes?

A /21 summary covers eight /24 subnets (10.0.0.0 through 10.0.7.255), which over-summarizes and advertises address space not present in the exhibit.

A /22 prefix (255.255.252.0) summarizes exactly four consecutive /24 networks that share the same first 22 bits, such as 10.0.0.0 through 10.0.3.255. This is the most precise summary that covers all routes in the exhibit without advertising additional unused address space.

A /23 summary covers only two /24 subnets (10.0.0.0 and 10.0.1.0), which under-summarizes and fails to include all routes shown.

A /24 represents a single subnet and provides no summarization benefit; it does not consolidate multiple routes into one advertisement.