How can an effective marketing mix be arrived at?

How can an effective marketing mix be arrived at?

An organisation can achieve an effective marketing mix by devising it in such a way that it:
a.Meets the requirements of the customers.

b.Is able to meet the marketing objectives of the organisation.

c.Is balanced or in the right proportion.

d. Is consistent enough .

e.Gives that edge or added advantage to the business as compared to its competitors.