A group of 10 smokers agreed to participate in the smoke-no-more program. Of the 10 participants, 4 were able to quit smoking as a result of the program. A sample of 6 participants was obtained. Let X equal the number of participants who quit smoking as a result of the program. What is the standard deviation of X?(a) 1.20(b) 2.40(c) 0.80(d) 0.64(e) 1.44