Final answer:
Verbal, nonverbal, and written communication skills are all part of a) communication skills.
Step-by-step explanation:
Verbal, nonverbal, and written skills are collectively known as communication skills. These skills encompass various forms of communication, such as speaking, listening, presenting, and writing.
For example, being able to express ideas clearly and effectively through spoken words represents verbal communication skills.
Understanding body language and using nonverbal cues to convey messages represents nonverbal communication skills. Lastly, the ability to convey information and ideas in written form represents written communication skills.