Consists of connecting directly with carefully targeted consumers, often on a one-to-one, interactive basis.

a. marketing without segmentation
b. mass marketing
c. direct marketing internal marketing
d. standardized marketing

Direct marketing

Explanation:

The direct marketing is one of the type of marketing communication in which the various types products, brands and the services are get promoted to the consumers.

  In this type of marketing strategy, the organization are directly contact with the consumers for supply or promote their products and brands and also communicate for the direct response.

The direct marketing is also known as the direct response marketing strategy.  

Therefore, Direct marketing is the correct answer.