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For two non - zero complex numbers z 1 and z 2 , if Re ( z 1 z 2 ) = 0 and Re ( z 1 + z 2 ), then which of the following are possible ? A. Im( z 1 ) > 0 and Im( z 2 ) > 0 B. Im( z 1 ) < 0 and Im( z 2 ) > 0 C. Im( z 1 ) > 0 and Im( z 2 ) < 0 D. Im( z 1 ) < 0 and Im(z 2 ) < 0 Choose the correct answer from the options given below

1. B and C
2. B and D
3. A and B
4. A and C

Correct answer: B and C

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