Question: Write a program that prompts the user to enter a hex digit and displays its corresponding binary number in four digits. For example, hex digit

Write a program that prompts the user to enter a hex digit and displays its corresponding binary number in four digits. For example, hex digit 7 is 0111 in binary. Hex digits can be entered either in uppercase or lowercase. For an incorrect input, display invalid input. Here is a sample run:

Enter a hex digit: B
The binary value is 1011
Enter a hex digit: G
G is an invalid input

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