This is a question with answer options. Goal: When building a sunroom addition with a cathedral ceiling, where should I put my support beams?

Which of the following methods is more reasonable for accomplishing this goal?

Choices:
(a). one of the support beams has to be placed right at the edge of the sun room. This is because there needs to be a post going from the floor of the sun room up to the bottom of the ridge board and that needs support from above
(b). one of the support beams has to be placed right at the edge of the sun room. This is because there needs to be a post going from the floor of the sun room up to the bottom of the ridge board and that needs support from underneath...I think the answer is
(b).