The disk data that the FILES table in INFORMATION_SCHEMA stores is . . . . . . . .

In MySQL's INFORMATION_SCHEMA database, the FILES table stores information about files on disk that relate to tables in databases managed by the MySQL server. This includes data files, index files, and other related files. The disk data stored in the FILES table pertains to the NDB (Network DataBase) storage engine, which is used in MySQL Cluster for high availability and scalability. Therefore, Option A is the correct answer.