A company$$s clients know who to contact for irregularities in billing. This follows which COSO principle?

Select answer from the options below

Principle $6$: The organization specifies objectives with sufficient clarity to enable the identification and assessment of risks relating to objectives.

Principle $9$: The organization identifies and assesses changes that could significantly impact the system of internal control.

Principle $15$: The organization communicates with external parties regarding matters affecting the functioning of internal control.

Principle $4$: The organization demonstrates a commitment to attract, develop, and retain competent individuals in alignment with objectives.