Which of the Following Holds True for Brand-Loyal Customers

Which of the following holds true for brand-loyal customers?

A) They are less sensitive to product quality.
B) The marketing costs of reaching loyal consumers are very high.
C) They need an extra push to buy the firm's brands.
D) A high level of brand loyalty insulates the firm from competition.
E) They are a drain on a firm's finances as they need to be constantly rewarded.