Which of the Following Is the Best Guideline for Adapting

Which of the following is the best guideline for adapting text and colour selections for each slide of your multimedia presentations?

A) Use light text on a dark background for presentations in lightened rooms.
B) Never break the rule which states six bullets per screen, six words per bullet.
C) Use light text on a light background for a professional, peaceful look.
D) Use dark text on a light background for presentations in darkened rooms