If \( \alpha, \beta \in \mathrm{R} \) are such that \( 1-2 \mathrm{...

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If \( \alpha, \beta \in \mathrm{R} \) are such that \( 1-2 \mathrm{i} \) (here \( \mathrm{i}^{2}=-1 \) ) is a root of \( z^{2}+\alpha z+\beta=0 \), then \( (\alpha-\beta) \) is equal to :
P
[JEE Main-2021 (February)]
(a) \( -7 \)
(b) 7
(c) 3
(d) \( -3 \)
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