Key indicators of involvement in an experienced community of practice (the person's level of engagement with the given practice community) are a shared vocabulary,recall of previous lessons,learning from one another,and:

A) beliefs leading to different scanning orientations.
B) performance under pressure.
C) open communication.
D) diversity of knowledge.

Open communication is a key indicator of involvement in an experienced community of practice. This allows members to share and learn from one another in a safe and trusting environment, which is essential for the growth and development of the community. While the other options (beliefs leading to different scanning orientations, performance under pressure, and diversity of knowledge) may also be important for participation in a community of practice, they are not necessarily indicative of a person's level of engagement or involvement in the community.