Which of the following statement is correct regarding the principle of conservation of energy.

Concept:

Energy conservation: 

• The energy of an isolated system is conserved the energy may be transformed from one form to another form.
• Energy can neither be created nor destroyed.
• This principle has no valid proof but we have not seen any exception or violation of this rule.

Explanation:

• The total energy of an isolated system remains constant whether conservative forces are working or non-conservative forces are working.
• The energy conservation rule has no valid proof so that it can be proved.
• Also, no violation has been seen of this rule till now.
• So both the statements are correct statements.
• Hence the correct answer is option 3.