The answer is A. war dialing
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Explanation:
After many long and difficult meetings, Kennedy decided to place a naval blockade, or a ring of ships, around Cuba. The aim of this "quarantine," as he called it, was to prevent the Soviets from bringing in more military supplies. He demanded the removal of the missiles already there and the destruction of the sites.
Answer:
they watch and warn others when someone/thing is coming
Explanation: