Best would be FD & Savings..
IFthat option doesnt exist, it is possible with long term invested stocks too...to be safe, make a table of publicly traded investments, take the 5 year low values and high values from exchange, and show the mid point to assess the valuation. If you can show the trading volumes of your stock to highlight easy liquidity and make a strong case, great. You can highlight with supportings they are long term investments (date of purchase), it adds completeness to your case. All the best.