正解:C
The process of summarizing routes in OSPF involves:
* Identifying the contiguous networks that can be summarized.
* Using the area range command on the ABR to specify the summary address and mask.
* Applying the command to the area that contains the detailed routes, not the area where the summary is to be advertised.
References: For detailed instructions and examples, refer to the Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) source book and study guide, which provide comprehensive coverage of OSPF route summarization on Cisco routers