Consider the following statements –

1. Causing miscarriage, public nuisance, offence against public safety, morals are covered under section 91

2. Section 91 is an exception to the general exceptions contained in sections 87, 88 and 89 of the code

3. The underlying principle of section 91 is “consent may wipe off an injury to the person consenting but if the gravamen of the offence is not the injury but something else, the consent can have no effect on the offence”.

4. Section 91 is an extension of the principle laid down in sections 87, 88 and 89

Which is correct?