A major challenge in designing marketing communications is being able to grab the attention of the target audience in a crowded media field. Which of the following factor(s) contribute to creating this challenge?

a. Fragmentation of mass media
b. Proliferation of alternative ways to reach consumers
c. Increasing skepticism of consumers in receiving marketers' messages
d. Desire of consumers to co-create the meaning of brands
e. All of the answers are correct