What effect does the Break Tangent action have on a selected animation tangent?

Allows manipulation of the in and out tangent handles individually so you can edit the curve segment entering or exiting the key without affecting its opposite handle.

Causes the manipulation of an in or out tangent handle to affect its opposite handle equally

Specifies that when you move a tangent, only its angle can be changed.

Specifies that when you move a tangent its angle and weight can be changed.