An office supply store offers banner printing services. The store charges $4 to print each one-foot-long section of a banner that is three feet tall. Which graph represents the cost to print a three-foot-tall banner that is x feet long? On a coordinate plane, a graph titled Banner Printing Services shows Length of banner in feet on the x-axis and cost in dollars on the y-axis. A step graph has horizontal segments that are each 3 units long. The left end of each segment is an open circle. The right end of each segment is a closed circle. The first segment goes from (0, 8) to (3, 8), the second segment goes from (3, 20) to (6, 20), the third segment goes from (6, 32) to (9, 32). On a coordinate plane, a graph titled Banner Printing Services shows Length of banner in feet on the x-axis and cost in dollars on the y-axis. A step graph has horizontal segments that are each 1 unit long. The left end of each segment is an open circle. The right end of each segment is a closed circle. The left-most segment goes from (0, 8) to (1, 8). Each segment is 1 unit higher and 1 unit farther to the right than the previous segment. The right-most segment goes from (8, 40) to (9, 40). On a coordinate plane, a graph titled Banner Printing Services shows Length of banner in feet on the x-axis and cost in dollars on the y-axis. A step graph has horizontal segments that are each 1 unit long. The left end of each segment is an open circle. The right end of each segment is a closed circle. The left-most segment goes from (0, 4) to (1, 4). Each segment is 1 unit higher and 1 unit farther to the right than the previous segment. The right-most segment goes from (9, 40) to (10, 40). On a coordinate plane, a graph titled Banner Printing Services shows Length of banner in feet on the x-axis and cost in dollars on the y-axis. A step graph has horizontal segments that are each 3 units long. The left end of each segment is an open circle. The right end of each segment is a closed circle. The first segment goes from (0, 12) to (3, 12), the secon