$44-$ It is the acquisition or establishment, direct or infirect, by one or more persons, whether by purchase or lease of shares or assets, by amalgamation or by combination or otherwise, of control over or significant interest in the whole or a part of a business of a competitor, supplier, customer or other people. What is the process called?

a$-$Merger

b$-$ Demerger

c$-$ Investment

d$-$ Trust