Given the below figure, which illustrates two different development processes $($A and B$)$:

Select one or more:

a$.$ Both Process A and Process $B$ represent plan$-$based methodologies

b$.$ None

c$.$ In process B$,$ iterations occur across activities.

d$.$ Process A demonstrates iterative development and regular client feedback

e$.$ Process A shows extensive documentation and upfront planning

f$.$ Process B demonstrates iterative development and regular client feedback