What is the ruling on participating in the "Al Naim" Islamic Investment Fund of the National Bank of Abu Dhabi, taking into consideration the fund's operational method, including deposit and withdrawal fees and the availability of a Sharia supervisory board?

Some general regulations for the permissibility of participating in investment funds are mentioned, namely: that both the capital and the fund manager have a pro-rata share of the profit, that the capital is not guaranteed, that the fund's shares belong to a company that conducts permissible activities and does not place its money in interest-based banks, and that the Mudarabah (definition) capital bears only the necessary actual expenses. If it does not adhere to the aforementioned regulations, participation in it is not permissible.