6. To answer the objective of the study, Lilliefors used different data collection methods. First, she gathered information about the variables of interest by letting the patients answer a self-administered questionnaire. Second, to supplement the data she gathered, she collected the sociodemographic profile of the patients using the data from the Department of Health. The methods of data collection used by Lilliefors are O A. objective and subjective, respectivcly O B. subjective and objcctive, respectivcly OC. objective and use of existing records., rcspéctively OD. subjective and use of existing records, respectively

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