Use X, Y, Z as they are. *=0, y=3, z=1 Using one-minute returns on Yandex (YNDX) and Coinbase (COIN) over the 252 trading days, a 'quadratic trend' model was estimated on the squared returns on each stock and on the produce of the returns on these stocks. The results are presented below: YNDX1 = 0.1X - 0.0Y * MINS, + 0.000YX * MINS, + up COIN! = 0.4Y - 0.03X * MINS, + 0.000XY * MINS? + vt YNDXI * COIN,! = 0.7 - 0.001 * MINS, + 0.002ZZ * MINS, + Wt Where MINS, is a variable equal to the number of minutes between midnight and the time of trade, t. Assume that the conditional means of the returns on both stocks equal to zero. A) What is the 'quadratic trend' model, and what is designed to capture? Are there any alternative models? Please provide pros and cons of both models. B) What would the above three models predict for the variance of one-minute returns on a portfolio that contains one share of Yandex (YNDX) and one share of Coinbase (COIN)? C) At what time in the trade day would this portfolio be the least risky