Answer :
An advantage of the indexed sequential access method is that both sequential and random access can be used to access records, depending on the number being accessed.
What is a primary key?
In database management system (DBMS), a primary key can be defined as a field whose value uniquely identifies each data record in a table or relational database.
What is ISAM?
ISAM is an abbreviation for indexed sequential access method and it can be defined as an advanced sequential file organization in which data records are stored in the file by using the primary key.
In conclusion, we can infer and logically deduce that an advantage of the indexed sequential access method is that both sequential and random access can be used to access data records, based on the number being accessed.
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Complete Question:
The advantage of the _____ access method is that both sequential and random access can be used to access records, depending on the number being accessed.
a. indexed sequential
b. progressive
c. direct random
d. random-serialized