Which of the following serves as a definition for decision variables for recency and frequency?
a. 1 if customers in a given recency and frequency should not be reached; 0 otherwise
b. 1 if customers in a given recency and frequency should be reached; 0 otherwise
c. 1 if customers in a given recency or frequency should not be reached; 0 otherwise
d. 1 if customers in a given recency or frequency should be reached; 0 otherwise
B
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