Privatisation in India has taken place in all cases except CMC, BALCO, and VSNL. The correct answer is option 'D' - None of the above.

Privatisation refers to the transfer of ownership, control, and management of state-owned enterprises to private entities. This process aims to increase efficiency, improve service quality, and attract investment in various sectors. In India, privatisation has been a significant part of economic reforms since the 1990s.

Let us delve into each case mentioned in the options to understand why they do not fit the criteria of privatisation in India:

1. CMC (Computer Maintenance Corporation): CMC is a subsidiary of the state-owned company, Tata Consultancy Services (TCS). It was not privatised but rather acquired by TCS in 2001. Therefore, it does not qualify as a case of privatisation.

2. BALCO (Bharat Aluminium Company Limited): BALCO was a state-owned enterprise that was privatised and sold to Sterlite Industries in 2001. This case does not fit the criteria mentioned in the options.

3. VSNL (Videsh Sanchar Nigam Limited): VSNL was a state-owned telecommunications company that was privatised and sold to the Tata Group in 2002. This case also does not align with the options given.

Therefore, the correct answer is 'D' - None of the above. It implies that privatisation has taken place in all cases mentioned in the options, including CMC, BALCO, and VSNL.

Privatisation in India has occurred in various sectors such as telecommunications, aviation, banking, and electricity generation. Some notable examples include the privatisation of Air India, Hindustan Zinc Limited, and Bharat Petroleum Corporation Limited. These initiatives aim to promote competition, increase efficiency, and reduce the burden on the government's fiscal resources.

In conclusion, the process of privatisation in India has been an essential aspect of economic reforms. While CMC, BALCO, and VSNL were mentioned in the options, they do not reflect the correct answer as these cases have indeed undergone privatisation.