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Select and write the correct answer from the given alternatives in each of the following: if `z_1 = 3 + 2i` and `z_2 = 5 - 4i`, then `|z_1 + z_2|` is

A

a) `sqrt(13) + sqrt(41)`

B

b) `sqrt(60)`

C

c) `sqrt(68)`

D

d) 0

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