When DUP_VAL_ON_INDEX exception does is raised?

A) An invalid username or password is used to log on to the database by a program.

B) When character strings are converted to numbers, it is raised if the string did not represent a valid number.

C) A unique index column with duplicate values is raised when this error occurs.

D) The error is raised if an attempt is made to close an unopened cursor or perform a cursor operation without permission.

Correct Answer : A unique index column with duplicate values is raised when this error occurs.

Explanation : DUP_VAL_ON_INDEX exception is raised when an attempt is made to close an unopened cursor or perform a cursor operation without permission.