Definition: You are given a question on public relations. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: What two elements do the planning models of Hendrix (2002), Kendall (1999), Merston (1963) and Parkinson and Ekachai (2006) have in common?
(A)Research and evaluation (B)Strategy and evaluation (C)Strategy and implementation (D)Objectives and implementation

A