What is the bucket approach?

Question $12$ options:

a$)$

A strategy whereby savings take place one fixed calendar date every several months. The large amount placed into savings at this time is the $$bucket$.$

b$)$

A strategy where separate savings accounts are created for each need. Each account is a separate $$bucket$.$

c$)$

The mistake some people make whereby they only save when large cash flows are received, similar to dipping a bucket into a river.

d$)$

Both a and b above.

e$)$

None of the above.