Question: Which choice adds `b` to each row of `a`?

1. a = a + reshape(b, 4, 1);
2. a = a + b';
3. a = a + repmat(b, 4, 1);
4. a = a + [b b b b];

Answer: The correct answer of the above question is Option C:a = a + repmat(b, 4, 1);