Stock A has an expected return of 5% and standard deviation of 7%. Stock B has an expected return of 13% and standard deviation of 20%. What is the standard deviation of a portfolio with 30% in stock A and 70% in stock B when the correlation coefficient is 0.5?

1. 16.73%

2. 15.16%

3. 14.89%

4. 13.50%

5. 12.82%