Changes

=== Normally Open (N.O.) and Normally Closed (N.C.) ===

Using the continuity setting on your multimeter, determine which is your Normally Open (N.O.) and which is your Normally Closed (N.C.) pushbutton switch. Building a simple switch and light bulb circuit, test out how each one behaves (i.e. directly experience it for yourself):

=== Selector Switch ===