The principles of attention to product placement

Applying the principles of attention to product placement in movies or TV shows would lead you to think:
a)since attention is goal-directed, product placement should be crafted around the viewers’ main goal in watching the movie/show
b)since subtle influences are the most powerful, product placement should be very subtle
c)since visual attention tends to be diverted to whatever is most visually striking, visual appearance is the most important aspect of product placement
d)since attention is basically unlimited, any visible appearance of a product is likely to be noticed