Select and write the correct answer from...

Select and write the correct answer from the given alternatives in each of the following: For all `z_1, z_2 in C` which of the following is correct?

A

a) `|z_1z_2| = |z_1| |z_2|`

B

b) `arg (z_1 z_2) = (arg z_1) (argz_2)`

C

c) `|z_1 + z_2| = |z_1| + |z_2|`

D

d) `|z_1 - z_2| ge |z_1| - |z_2|`

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