Which graph represents the function f(x) = 4⌈x⌉? On a coordinate plane, a step graph has horizontal segments that are each 2 units long. The left end of each segment is a closed circle. The right end of each segment is an open circle. The left-most segment goes from (0, 4) to (1, 4). Each segment is 2 units higher and 2 units farther to the right than the previous segment. The right-most segment goes from (3, 16) to (4, 16). On a coordinate plane, a step graph has horizontal segments that are each 2 units 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 2 units higher and 2 units farther to the right than the previous segment. The right-most segment goes from (3, 16) to (4, 16). On a coordinate plane, a step graph has horizontal segments that are each 2 units long. The left end of each segment is a closed circle. The right end of each segment is an open circle. The left-most segment goes from (0, 0) to (1, 0). Each segment is 2 units higher and 2 units farther to the right than the previous segment. The right-most segment goes from (3, 12) to (4, 12). On a coordinate plane, a step graph has horizontal segments that are each 2 units 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, 0) to (1, 0). Each segment is 2 units higher and 2 units farther to the right than the previous segment. The right-most segment goes from (3, 12) to (4, 12).