Which reason best supports Zimmermann’s claim in The Code Book that "cryptography is about political power”?

Governments use cryptography to protect classified information from being leaked to the public.
Politicians use cryptography to send messages to each other about new legislation.
Cryptography allows individuals to protect their freedom of speech in a healthy democracy.
For thousands of years, governments and leaders of civilizations have used various forms of cryptography.

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recent brain research has shown some surprising benefits as a result of formal musical training. learning to play a musical instrument appears to develop parts of the brain that can even influence academic results. the studies indicate that the earlier a child begins training, the more benefits there are. one such study showed that children who began musical studies before the age of seven had a more developed brain in the region where language production and auditory processing take place. scientists believe there is mounting evidence to show that early musical training can improve brain function.

explanation:

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