For each of the following file processing operations, indicate whether a sequential file, indexed random file, indexed sequential access method (ISAM), hashing, or pointer structure works the best. You may choose as many as you wish for each step. Also, indicate which would perform the least optimally.
a. Retrieve a record from the file based upon its primary key value.
b. Update a record in the file.
c. Read a complete file of records.
d. Find the next record in a file.
e. Insert a record into a file.
f. Delete a record from a file.
g. Scan a file for records with secondary keys.