Which conjunction or disjunction is equivalent to the open sentence |a – 9| ≤ 4.




A.
a – 9 ≥ 4 and a – 9 ≤ –4



B.
a – 9 ≤ 4 or a – 9 ≥ –4



C.
a – 9 ≤ 4 and a – 9 ≤ –4



D.
a – 9 ≤ 4 and a – 9 ≥ –4