Over the past year Alphabet Co. has revenue of $21 Billion and earnings per share of $32. It paid $6 per share in dividends, $7 per share in stock buybacks and reinvested $18 per share. Over the past year the company's stock price traded in a range from $123 to $189 and it currently trades at $150. What is Alphabet's dividend yield? a) 4% b) 2.5% c) 5% d) Not enough information is provided