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What is the output of the following code:

os=Unix
echo 1.$os 2."$os" 3.'$os' 4.$os

a) 1.Unix 2.Unix 3.Unix 4.Unix
b) 1.Unix 2.Unix 3.$os 4.Unix
c) 1.Unix 2.Unix 3.Unix 4.$os
d) 1.Unix 2.$os 3.$os 4.$os

b) 1.Unix 2.Unix 3.$os 4.Unix

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