Consider the following do-while loop, whose job is to check for a valid customer identification number between the numbers 100 and 1999:do{ cout << "\nEnter an identification number: "; cin >> idNum;}while ( // Missing expression goes here);Which of the following is the correct missing expression?
A. idNum >= 100 && idNum <= 1999
B. idNum < 100 || > 1999
C. idNum < 100 || idNum != 2000
D. idNum < 100 || idNum > 1999
Answer: D
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