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a

i and ii are true

b

ii, iii and iv are true

c

i, ii and iii are true

d

ii and iv are true

answer is D.

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Detailed Solution

| +| = | -|This will be true when either or is zero. Also when and are perpendicular.(α = 900) ,|+| =  | -| = So Option - (4) is right
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