Problem: Correlational research is empirical studies where the researchers explore the relationship between two measured variables. From the options below, which empirical study we discussed below represents an example of this type of correlational research? Question options: a) Multivariate; The Cacioppo et al. (2013) study where meeting venue for couples and marriage breakup was assessed. b) Naturalistic observational; The Mehl et al. (2010) study where small talk and well-being were assessed. c) Bivariate; The Mehl et al. (2010) study where small talk and well-being were assessed. d) Multivariate; The Eron et al. (1972) study where preference for violent TV and aggression levels where assessed at two time points. e) Longitudinal; The Eron et al. (1972) study where preference for violent TV and aggression levels where assessed at two time points.