Given below is the DNA coding sequence. Its complementary strand would read as:

5'-GTATTACG-3'

3'-CATAATGC-5'

The correct answer is Option (2) → 3'-CATAATGC-5'

The complementary strand of a DNA sequence is formed by pairing the nitrogenous bases according to base-pairing rules:

• A (Adenine) pairs with T (Thymine)
• T (Thymine) pairs with A (Adenine)
• G (Guanine) pairs with C (Cytosine)
• C (Cytosine) pairs with G (Guanine)

Now, for the given DNA coding sequence 5'-GTATTACG-3', its complementary strand:

• G pairs with C
• T pairs with A
• A pairs with T
• T pairs with A
• T pairs with A
• A pairs with T
• C pairs with G
• G pairs with C

Thus, the complementary strand reads as: 3'-CATAATGC-5'