Determine which situation is represented by the given dot plot. A. Across the state, 15 cities were given a score between 0 and 15 regarding the cleanliness of their community. B. Billy bought between 0 and 6 shirts from each of his favorite 6 stores. C. Henry has 15 classmates and each has between 0 and 6 pets. D. Each of Jessica's 6 friends has between $0 and $15 in his or her wallet.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?