Question

What was the mission of al-Qaeda?

to force the Soviet Union's troops out of Afghanistan and destroy their supporters
to train the Taliban forces and help them form a government in Afghanistan after the Soviets left
to destroy all non-Muslims and their Muslim supporters and form a central Islamic government
to destroy all terrorist training camps outside of Afghanistan and keep their militants close at hand for assignments
to remove foreigners from Arab land and, once gone, to leave them alone