In an organization's database ERD $($Entity Relationship Diagram$),$ there are entities named "Departments" and "Employees". Each Department consists of many employees, and each employee is assigned to only one Department. What type of relationship exists between the "Departments" and "Employees" entities in this ERD?

Question $28$ options:

A$)1$:$1$

B$)1$:M

C$)$ M:N

D$)$ Undefined