Let \( z_{1} \) and \( z_{2} \) be \( n \)th roots of unity which s...

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Let \( z_{1} \) and \( z_{2} \) be \( n \)th roots of unity which subtend a right angled at the origin, then \( n \) must be of the form (where, \( k \) is an integer)
(2001, 1M)
\( \mathrm{P} \)
(a) \( 4 k+1 \)
(b) \( 4 k+2 \)
(c) \( 4 k+3 \)
(d) \( 4 k \)
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