Select the objective from the list below that should be measurable:

Question $35$ options:

a$)$

at the end of the training session, trainees will value customer service skills.

b$)$

at the end of the training session, trainees will appreciate the value of using good customer service skills.

c$)$

at the end of the training session, trainees will demonstrate the use of the three components of answering incoming calls.

d$)$

at the end of the training session, trainees will understand how to use effective customer service skills.