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The three points whose position vectors are $\hat{i} +2 \hat{j} +3\hat{k}, \; 3 \hat{i} + 4 \hat{j} +7 \hat{k}$ and $- 3 \hat{i} - 2 \hat{j} - 5 \hat{k}$ :

( A ) are collinear
( B ) are the vertices of an equilateral triangle
( C ) are the verices of an isosceles triangle
( D ) are the vertices of a right angled triangle

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