For which of the following situations, old profit sharing ratio of partners is used at the time of admission of a new partner?

For which of the following situations, old profit sharing ratio of partners is used at the time of admission of a new partner?

a) When new partner brings only a part of his share of goodwill

b) When new partner is not able to bring his share of goodwill.

c) when, at the time of admission, goodwill already exists in the Balance Sheet.

d) When new partner brings his share of goodwill in cash.