Privatisation of the Public Sector enterprises by selling a part of PSE to the Public is known as :

Disinvestment

The correct answer is option (4) : Disinvestment

The tern for privatization of public sector enterprises by selling a part of them to the public is known as "Disinvestment." This process involves the government selling its shares in public sector enterprises to private investors or the public. Disinvestment if often undertaken to reduce the government's stake in these enterprises, encourage private participation, and mobilize funds for various purposes.