4. which of the following statements is correct?

a. four-way switches have the word "on" engraved on their handles.
b. four-way switches contain internal wiring.
c. three-way switches have two common terminals.
d. three-way switches are wired internally.

Which source would provide the most bias-free information about smoking and increased health risks? a) a website created by heart disease patients b) a research study conducted by the mayo clinic eliminate c) a public service message sponsored by tobacco companies d) an online question forum conducted by attorneys for cardiac specialists