Which of the Following Is Considered to Be One of the Four

Which of the following is considered to be one of the four problems that can deter a firm from using CRM (customer relationship marketing)

A) Competitors can often hack into CRM systems.
B) Building and maintaining a customer database requires a large investment.
C) It is very difficult to find and train database employees.
D) Long-term results of such systems are still unproven.
E) Focusing too much on databases separates a company from its customers.