Flux emitted from a 1cd light source in all directions,

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Flux emitted from a 1cd light source in all directions, in lumens, would be _______.

1. 6 to 11
2. 12 to 13
3. 22 to 33
4. 21 to 36

Correct Option: B

Flux emitted from a 1cd light source in all directions, in lumens, would be 4π.