Which of the following represents the top view of the figure

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?

Me on this i beg you on this to answer!

Select the correct answer from the drop-down menu. find the missing term. m-n/m^2-n^2+? /(m-1)(m-n)=2m/m^2-n^2 replace the question mark with to make the equation true.