Choose the correct description of the graph of the compound inequality
x − 1 less than or equal to 9 or 2x greater than or equal to 24
a. a number line with an open circle on 10, shading to the left, and an open circle on 12, shading to the right
b. a number line with an open circle on 10, an open circle on 12, and shading in between
c. a number line with a closed circle on 10, a closed circle on 12, and shading in between
d. a number line with a closed circle on 10, shading to the left, and a closed circle on 12, shading to the right