What does the InitialDelay property of the ToolTip determine?

a) The amount of time that the tool tip appears while the mouse is over a control.
b) The amount of time that a mouse must hover over a control before a tool tip appears.
c) The amount of time between which two different tool tips appear.
d) The amount of time in which the tool tip is hidden for.

b) The amount of time that a mouse must hover over a control before a tool tip appears.