Disputes related to paternity can be solved by :

The correct answer is Option (1) → DNA finger printing

Option (1) DNA finger printing — Correct. DNA fingerprinting compares the repetitive DNA (such as VNTRs) of individuals; a child inherits half of these patterns from each parent. So it is used to settle paternity disputes, as well as in forensic work.

NCERT Extract:
DNA Fingerprinting – “… Since DNA from every tissue (such as blood, hair-follicle, skin, bone, saliva, sperm etc.), from an individual show the same degree of polymorphism, they become very useful identification tool in forensic applications. Further, as the polymorphisms are inheritable from parents to children, DNA fingerprinting is the basis of paternity testing, in case of disputes.”