Which of the following is true about the values of 2^x and 2x+2 for x > 0? ( ) A. For all x > 0, it is true that 2^x < 2x + 2. B. For all x > 0, it is true that 2^x > 2x + 2. C. There is a constant c such that if 0 < x < c, then 2^x < 2x + 2, but if x > c, then 2^x > 2x + 2. D. There is a constant c such that if 0 < x < c, then 2^x > 2x + 2, but if x > c, then 2^x < 2x + 2.