Time left $0$:$25$:$07$

In conducting research, firms must decide whether to collect their own $($primary$)$ data or use data that already exist $($secondary data$).$ They must also choose a research approach, which of the below are types of research approaches a marketer may use, select all that apply:

a$.$ Behavioral

b$.$ Contact Methods

c$.$ Observational

d$.$ Sampling Plan

e$.$ Data$-$mining

f$.$ Focus group

g$.$ Survey