In circle D, which is tangent to the circle?
GH
AB
CD
EF

D is the given circle. The tangent to the circle D is line AB.
Tangent to a circle is a line that touches it only at one point. Secant is the line that intersects the circle at two points.
Based on the definition of tangent and secant to a circle, following things can be observed:
Therefore, the tangent to the circle D is line AB.
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