Excess-3 code of decimal number 2 is:

To find the Excess-3 code of a decimal number, add 3 to the given decimal number and then convert the resulting sum into its 4-bit binary equivalent:

1. Add 3 to the decimal digit:

   2 + 3 = 5

2. Convert the sum (5) to 4-bit binary:

   (5)10 = 01012

Thus, the Excess-3 code for decimal 2 is 0101. The correct option is A.