Which of the following is not one of the six logical units of a computer?

You can use layers to make shapes appear to be stacked on top of one another. To move a shape from one layer to another, use options from the _____ group.

A. Arrange B. Reorder C. Layers D. Styles

_________ in TinyOS may be tied either directly or indirectly to hardware events.

A) ?Commands ? B) ?Tasks ? C) ?Timers ? D) ?Events