Select the best command from the following list that would list the contents of either Java source files or PDFs in subdirectory named folder in long format: Select all that apply

a$.$ cd $-$Is $../$folder$/*$pdf

b$.$ Is "folder$/$java$|$pdf$"$

c$.$ Is $-$r "folder$($java$,$pdf$)"$

d$.$ Is $-$r "subfolder$/$java$,$pdf$"$

f$.$ Other: provide your answer on the answer sheet