The data set below contains data on direct marketing campaigns of a banking institution. Clients were contacted by phone with the goal of having them subscribe to a term deposit $($that is$,$ open a certificate of deposit $($CD$)$ account$).$

Bank data.xIsx

$($Note: The file may not open when using Microsoft Edge. Use another browser or right$-$click "Save link as$"$ to download the data file.$)$ Which of the variables in this data set are numerical variables? Select all that apply.

a$.$ age

b$.$ marital status

c$.$ education

d$.$ default

e$.$ balance

f$.$ housing

g$.$ loan

h$.$ day

i$.$ month

j$.$ duration

k$.$ campaign

I. previous contacts