When Will the Following Loop Terminate? While Keep_on_going != 999

Multiple Choice

When will the following loop terminate? while keep_on_going != 999 :

A) When keep_on_going refers to a value less than 999
B) When keep_on_going refers to a value greater than 999
C) When keep_on_going refers to a value equal to 999
D) When keep_on_going refers to a value not equal to 999