The Mahatma Gandhi National Rural Employment Guarantee Act (MGNREGA) is a social security scheme that aims to provide livelihood security in rural areas by providing at least 100 days of guaranteed wage employment in a financial year to every household.

Option 1 says "Providing up to 100 days of skilled labour in a financial year". This is incorrect because MGNREGA guarantees wage employment, not skilled labour. The labor usually involves unskilled work, typically manual labour in nature.

Option 2, "Creation of productive assets" is one of the objectives of MGNREGA as the work done under this scheme often involves the creation of infrastructure that benefits the rural community.

Option 3, "Enhancing livelihood security". That is the core objective of MGNREGA. It aims to enhance livelihood security in rural areas.

Option 4, "Ensuring empowerment to women". This is indeed among the objectives of MGNREGA because it mandates that one-third of the beneficiaries should be women, thereby actively promoting their participation and empowerment.

Hence, the provided answer is correct.