An advertising agency is testing the effectiveness of anew commercial. They are trying out the commercialin three different time lengths (15, 30, and 60 seconds)and two formats (animated vs. live action). Each test audience will rate the product after seeing the commer-cial shown in one way. Which description of this study is correct?a) An experiment with 2 factors (length and format),one having 3 levels (15, 30, 60) and the other having2 levels (animated and live) for 6 treatments.b) An experiment with 2 factors(length and format) at5 levels (15, 30, 60, animated and live) for 5 treatments.c) An experiment 1 factor (length) blocked by formatwith 3 levels (15, 30, 60).d) A sample survey with two questions and oneresponse.e) A sample stratified by length and format.

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