In Δ ABC, the straight line parallel to the side BC meets AB and AC at the points P and Q. respectively. If AP = QC, the length of AB is 16 cm and the length of AQ is 4 cm, then the length (in cm) CQ is:
1
\((2 \sqrt{21}+2) \)
2
\((2 \sqrt{18}-2) \)
3
\((2 \sqrt{17}-2) \)
4
\((2 \sqrt{19}+2) \)