Knowledge that can be readily articulated, codified, and shared best describes

A direct marketer can reduce the costs of catering to a market niche through the use of _____

a. specialogs b. prototype stores c. scrambled merchandising d. rationalized retailing

Which of the following notations in an E-R diagram means that the entity is optional and a relationship need not have an entity of that type?

A) vertical bar B) arrow C) double line D) small oval