Suppose we design a decimal adder for two digits represented in the excess-3 code. Which of the following regarding the correction after adding the two digits with a 4-bit binary adder is/are right?

1.) The output carry is equal to the carry from the binary adder.

2.) If the output carry = 0, then add 0011 3.) If the output carry = 1, then add 0011

4.) If the output carry = 0, then add 1101

5.) If the output carry = 1, then add 1101