If a, b, c are the sides of a triangle ABC, then \({a^{\frac{1}{p}}} + {b^{\frac{1}{p}}} - {c^{\frac{1}{p}}}\) where p > 1, is

• A. always negative
• B. always positive
• C. always zero
• D. positive if 1 < p < 2 and negative if p > 2