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The correct answer is option 2: 2 and 3 only.
Explanation:
The question asks about the development of electronic voting machines (EVMs) and the organizations involved in their development.
Option 1 includes Bharat Heavy Electricals Limited (BHEL), Bharat Electronics Limited (BEL), and Electronics Corporation of India Limited (ECIL). However, the correct answer only includes options 2 and 3, eliminating option 1.
Option 2 includes BEL and ECIL. These two organizations have indeed played a major role in the development of EVMs. BEL is a public sector company under the Ministry of Defence, specialized in the manufacturing of electronic voting machines. ECIL is a public sector company under the Department of Atomic Energy, involved in the design and development of electronic equipment including EVMs.
Option 3 includes BEL and Bharat Sanchar Nigam Limited (BSNL). This option is incorrect as BSNL is a telecommunications company and has not been involved in the development of EVMs.
Option 4 includes ECIL and BSNL, which is also incorrect for the same reason stated above.
To sum up, the correct answer is option 2, as only BEL and ECIL have collaborated