When you add a(n) grouping level, records are sorted according to entries in the group field.

In order to clear a ListBox’s items, the syntax is:

a) ListBox.Items.Clear() b) ListBox.Items.DeleteItem.All() c) ListBox.Clear() d) ListBox.Items.DeleteAll()

Digital cellular service uses several different competing standards that do not interoperate.

a. true b. false