ans should be B sequential is not fast and index sequential will take more pointers adjustment
The direct file organization is used to improve the performance in accessing the records as compared to sequential file organization. In direct file organization, the key value is mapped directly to the storage location. The usual method of direct mapping is by performing some arithmetic manipulation of the key value. This process is called hashing. When using this organization, an application such as on-line transaction processing system can be designed so that centralized data are not only instantly accessible but are always up-to-date.
