In recent years, guided by lasers and satellites have changed warfare. The military also can use to disarm roadside bombs. In addition, countries have used computers to spy on each other and commit .

The sentence says countries have used computers to spy on one another and commit harmful actions. Those actions are cyber attacks, which involve using computers or networks to disrupt, damage, or steal information. Disarmament means reducing weapons, and mobilization means preparing forces for action, so neither fits.

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