The Excess-3 code of the decimal number 26 is:

Excess-3 (XS-3) is an unweighted, self-complementing binary-coded decimal (BCD) code. To determine the Excess-3 code of a decimal number, add 3 ($0011_2$) to each decimal digit individually, then convert each resulting sum into its 4-bit binary equivalent:

1. Tens digit: $2 + 3 = 5 \rightarrow 0101_2$

2. Units digit: $6 + 3 = 9 \rightarrow 1001_2$

Combining the 4-bit groups yields: 0101 1001.

Option Analysis: