Answer either A or B

Answer either A or B below:

A) What is/should be the police mission in a free and democratic society? Has law enforcement evolved along with society? Are there areas requiring real improvement?

B) Are the police able to enforce all laws in all situations? If not, does this invalidate their mission or effectiveness? What about discretion? Is this necessary because they cannot enforce all laws in all circumstances or is discretion a necessary tool in any scenario?