An investor engages in a pairs trading strategy using shares of Walmart (WMT) and Target (TGT) stocks. The investor places $100,000 into her brokerage account and purchases $90,000 of Walmart shares, and short sells $90,000 of Target shares. Which one of the following statements is TRUE about the portfolio resulting from these trades? a. The gross leverage ratio of the portfolio =1.80. b. The net leverage ratio of the portfolio =0.90 c. The portfolio earns positive leveraged returns ONLY if WMT shares increase in value, and TGT shares decrease in value. d. The resulting initial margin on this portfolio investment =50%