The Processing Time Required to Maintain a Fully Inverted File

The processing time required to maintain a fully inverted file

A) is fast since the entire index can be loaded into primary memory.
B) is almost instantaneous because long indexes can be factored into subindexes.
C) is fast when two processors are used simultaneously to process the data and index files at the same time.
D) can be high since the indexes require more disk storage and must be updated whenever records are added, deleted, or changed.