Please help me this question. thank you so much

Dave gives a check to eTrade Finance to buy 100 shares of stock in AmaGoogle Corporation for Dave. The price of the shares is constantly fluctuating. eTrade asks Dave to leave the amount of the check blank and allow it to fill in the price when making the purchase. Dave agrees. eTrade buys the stock when the price is $4,000, but fills in the check for $5,000. The check is negotiated as payment for a $5,000 debt to G & H Accountants (G&H), which takes the check in good faith and without notice of eTrade's act. G&H later learns that eTrade was not authorized to fill in the check for $1,000 over the price. Is G&H an HDC? If so, for how much? Explain what a HDC is, what elements are required to be an HDC, and if G&H meet them.Explain your answer fully.