The correct answer is option 4, ASEAN.

The year 2002 Code of Conduct related to territorial and maritime disputes in the South China Sea was signed between China and ASEAN, which stands for the Association of Southeast Asian Nations. ASEAN is a regional organization composed of ten member countries, including Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Vietnam.

The Code of Conduct was an agreement aimed at promoting peace, stability, and cooperation in the South China Sea region. It outlined guidelines and principles for the peaceful resolution of disputes and called for the parties to exercise self-restraint and avoid actions that could escalate tensions. However, it`s important to note that the Code of Conduct was not a legally binding treaty, but rather a political document that expressed the intent to manage conflicts and enhance cooperation among the signatories.

In summary, the 2002 Code of Conduct related to territorial and maritime disputes in the South China Sea was signed between China and ASEAN, not the Philippines, Vietnam, or the United States of America.