Choose the best description of the shape of the graph of {{MATH_20}} on the time interval {{MATH_21}}. {{CMD_22}} {{CMD_23}}Increasing and concave up{{CMD_24}} {{CMD_25}}Increasing and concave down{{CMD_26}} {{CMD_27}}Decreasing and concave up{{CMD_28}} {{CMD_29}}Decreasing and concave down{{CMD_30}} {{CMD_31}} {{CMD_32}}