A competitive advantage becomes a sustainable competitive advantage when

a$)$ a company uses a competitive move designed to re 'rice a rival's market share or profits b$).$ a company collaborates with its competitors to obtain a larger market share

C$)$ marker commonglity is large, and companies have overlapping pro ducts or services

d$)$ other companies cannot duplicate the value a firm is providing to customes and have for the $n$ stopped trying