Explanation:

This question tests knowledge of the specific provisions within the Protection of Children from Sexual Offences (POCSO) Act, 2012, which is a comprehensive legislation designed to protect children from various forms of sexual abuse and exploitation. The Act meticulously defines different types of offenses and prescribes corresponding punishments. Let's examine each option in the context of the POCSO Act: * **Option (1) Section 12:** Section 12 of the POCSO Act deals with the *punishment* for sexual harassment. While it is directly related to sexual harassment, it does not *define* what constitutes sexual harassment. Instead, it specifies the penalties for committing the offense that is defined elsewhere in the Act. Therefore, this option is incorrect as it refers to punishment, not the definition. * **Option (2) Section 10:** Section 10 of the POCSO Act prescribes the *punishment* for 'aggravated sexual assault'. Aggravated sexual assault is a more severe category of offense than sexual harassment, defined in Section 9 of the Act. Since Section 10 deals with punishment for a different, more serious offense, it is not the correct answer for the definition of sexual harassment. * **Option (3) Section 9:** Section 9 of the POCSO Act is dedicated to defining 'aggravated sexual assault'. This section lists various circumstances that elevate a sexual assault (defined in Section 7) to an aggravated one, such as the perpetrator being in a position of trust, a police officer, or the act causing grievous hurt. It does not define 'sexual harassment'. Hence, this option is incorrect. * **Option (4) Section 11:** This is the correct answer. Section 11 of the POCSO Act, 2012, specifically defines 'sexual harassment'. It outlines various acts that constitute sexual harassment, including unwelcome physical contact and advances, a demand or request for sexual favours, showing pornography to a child, making sexually coloured remarks, or any other unwelcome physical, verbal, or non-verbal conduct of a sexual nature. This section provides the legal framework for identifying and prosecuting instances of sexual harassment against children. In conclusion, Section 11 is the precise provision within the POCSO Act, 2012, that deals with the definition of 'sexual harassment', making it the correct option.