Estimability in one-way ANOVA: the coefficient of $\mu$ must equal the sum of the $\alpha$ coefficients

Under one way fixed effects ANOVA which of the following parametric functions are estimable, where the model is $y_{ij}=\mu+\alpha_i+\epsilon_{ij}, i=1\dots p, j=1\dots n_i$, $\epsilon_{ij}$ are independent identically distributed with zero mean and finite variance.