Asian Development Bank (ADB) launched a Nature Finance Hub for Asia and the Pacific at COP28 aims to attract at least $2 billion into investment that incorporate nature-based solutions, focused on capital markets and other of private capital. The hub will deploy a range of measures to reduce risks in nature-based projects such as guarantees, impact-linked and blended finance options. The hub is about $1 billion in such de-risking funds from development partners with advanced discussions with several entities. Hence option (a) is the answer.