The line \(\overline{CD}\) meet the line \(\overline{AB}\) at C. If \(\overline{CE}\) and \(\overline{CF}\) are the angle bisector of the angles ∠ACD and ∠BCD respectively then find the value of ∠ECF:

1
80° 
2
100° 
3
70° 
4
90° 

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