Mathematics · Linear Regression

Let Yi = α + βxi + εi, i = 1, 2, 3, where xi's are fixed covariates, α and β are unknown parameters and εi's are independently and identically distributed normal random variables with mean 0 and variance σ2 > 0. Given the observations xi = (1, 2, 3) and yi = (2.1, 3.9, 6), which of the following statements is true?