Napa Auto is an international auto supply depot. They hold a selected few trusted brands, but a wide inventory for each brand they do house. Their advertising is very technical in nature, and typically aimed at those who streotypically own or work in auto garages. They tend to promote the size, width, weight, or speed of their tools. Which individual buying influenceis Napa subtly honing in on?

a) age

b) family life cycle

c) gender

d) personality/lifestyle