It is known that there are 6 balls, 3 wooden balls, and 3 leather balls. Among them, 5 balls are stained with red pigment, and 4 balls are stained with blue pigment. Which of the following statements is possibly correct? ['Two balls are stained with blue pigment but neither is stained with red pigment.', 'Three wooden balls stained with red pigment are not stained with blue pigment.', 'Two wooden balls are stained with red but not with blue.', 'Only one of the three wooden balls stained with blue pigment is stained with red pigment.']