Sally has a job as a sales consultant. Company policy requires that she completes at least 4 conference calls each day, but should spend no more than 4 hours total each day on conference calls. Each conference call is either an update call, which is 30 minutes long, or a kickoff call, which is 1 hour long. Let x represent the number of update calls and y represent the number of kickoff calls Sally completes in a given day. Select four options to create a system of four inequalities that best models this scenario.