The parabola with equation y \equal{} ax^2 \plus{} bx \plus{} c and vertex (h,k) is reflected about the line y \equal{} k. This results in the parabola with equation y \equal{} dx^2 \plus{} ex \plus{} f. Which of the following equals a \plus{} b \plus{} c \plus{} d \plus{} e \plus{} f?
(A) \ 2b \qquad (B) \ 2c \qquad (C) \ 2a \plus{} 2b \qquad (D) \ 2h \qquad (E) \ 2k conicsparabolageometrygeometric transformationreflectionfunctionAMC