A company uses two different-sized trucksto deliver concrete blocks. The first truck can transport x blocks per trip, and the second can transport y blocks per trip. The first truck makes S trips to a job site, while the second makes T trips. What does the following expressionrepresent in the context of the problem?xS + yTa. The totalnumber of trips that both trucks make to the job siteb. The total number of blocks thatboth trucks delivered to the job sitec. The average number of blocks that are being transported per tripd. Thetotal number of blocks that the first truck delivers to the job site