Which of the following statements regarding Ogas and Gaddam's 2011 study on human sexual behaviour is true?
a. Ogas and Gaddam could not distinguish between online fantasies and rational desires.
b. Ogas and Gaddam were unable to differentiate the data pertaining to the web searches and the websites.
c. Ogas and Gaddam found that women and men do not differ in their preferences.
d. Ogas and Gaddam were able to distinguish between a single and repeated search by the same person.