Symbol Company Price ($) Yield T AT&T 33.59 5.48% VZ Verizon 46.78 4.70% CVX Chevron 112.18 3.82% MCD Mcdonald's 93.70 3.63% PFE Pfizer 31.15 3.60% GE General Electric 25.27 3.48% MRK Merck 56.79 3.17% CAT Caterpillar 91.53 3.06% XOM ExxonMobil 92.45 2.99% KO Coca-Cola 42.22 2.89% You decide to make a small portfolio consisting of a collection of 5 of the top 10 Dogs of the Dow. (a) How many portfolios are possible? portfolios (b) How many of these portfolios contain VZ and MCD but neither KO nor XOM? portfolios (c) How many of these portfolios contain at least four stocks with yields above 3.5%? portfolios