The position vector of a point that divides the line segment joining $P \equiv(1,2,-1)$ and $Q \equiv(-1,1,1)$ externally in the ratio $1: 2$ is:
- A$3 \hat{i}-3 \hat{k}$
- B$3 \hat{i}+3 \hat{j}-3 \hat{k}$
- C$-3 \hat{i}+3 \hat{k}$
- D$3 \hat{i}+\hat{j}+3 \hat{k}$
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