Which statement about market analysis is most correct?

Question $1$ Select one:

a$.$

All approaches are valid as it heavily depends on the product.

b$.$

Backward analysis determines what is needed at the breakeven price.

c$.$

Competitor analysis compares with other existing product and extrapolate.

d$.$

Top$-$down analysis starts with total market size and dwells down.

e$.$

Bottom$-$up analysis, calculate based on users then multiply upwards