Any amount of electricity used by a customer (represented by an instance of the customer class) must contribute to the customer's bill (represented by the member variable bill) through the method useElectricity method. An instance of the customer class should never be able to tamper with or decrease the value of the member variable bill.
A. Option A
B. Option B
C. Option C
D. Option D
Answer: A
Given the code fragment:
What is the result?
A. Match 1
B. Match 2
C. No Match
D. A NullPointerException is thrown at runtime.
Answer: B
