Are tables that start with "B" and "C" both considered "Detailed Tables"?

Hi friends, 

I'm looking at the 2018 release schedule for this fall's ACS data.  My understanding is that the "Data Profiles" means tables that start with "DP", "Detailed Tables" mean the base tables (tables whose ID starts with "B"), and the the "Summary File" refers to the mega TXT or SAS files available via FTP. The "Subject Tables" that will be released in Jan. are the tables whose ID starts with "S").

First of all, is my understanding correct?  

Second, where to the tables whose ID starts with "C" fit into this?  Are these also considered "Detailed Tables"?

Thanks,

Diana