When a respondent is attempting to subscribe to Southwest Airlines e-mail of flight sales and is presented
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Question:
When a respondent is attempting to subscribe to Southwest Airlines e-mail of flight sales and is presented with a box that says: "You must provide your zip code in order to complete your registration," this is an example of:
a. a double-barreled response
b. error trapping
c. a radio button
d. zoning
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