Natalie purchased the following shares of Alpine stock: 54 shares for $1,546.49 in 2017. 67 shares for $1,798.59 in 2018. 98 shares for $2,435.37 in 2019. Natalie sold 132 shares of Alpine stock in 2020 and did not identify which shares she sold. What basis should she use for computing her gain or lose? $3,348, $3,543, $3,618, $3,780.