Walmart expects to pay a dividend of $2.28 next year and you expect these dividends to grow at 3.8% a year into indefinite future. The stock price of Walmart is $139 per share. What is your estimate of the Walmart's cost of equity capital?

a) 4.93%

b) 5.44%

c) 1.64%

d) 4.88%

e) 5.50%

f) 2.16%