Judith Has Invented a Cellphone Battery That Lasts for Two

Judith has invented a cellphone battery that lasts for two weeks without needing to be recharged. Some of her friends think she should just announce it to the world, and marketing isn't necessary. Other friends are recommending Judith look at segmenting the market which would help her to

A) keep within a reasonable marketing budget.
B) develop protection from competitive pressures.
C) ensure she will be able to patent the battery without letting the entire market know.
D) focus on those potential customers with the greatest need.