046C C
 Which of the following statements is true?
a) You should always use the "INT" setting for calling a Public Correspondence station.  
b) You should use Ch-22 when calling the U. S. Coast Guard. 
c) Using the "USA" setting changes certain channels from duplex to simplex operation.  
d) Using the "INT" setting will prevent proper Ch-13 bridge-to-bridge operations. 
