Which of the following models can be estimated using ordinary least squares (OLS), where X, y, Z are variables and α, β, γ are parameters to be estimated? (following a suitable rearrangement if necessary and support with detail explanation) a

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Which of the following models can be estimated using ordinary least squares (OLS), where X, y, Z are variables and α, β, γ are parameters to be estimated? (following a suitable rearrangement if necessary and support with detail explanation)

a.       y_t = α + βx_t + u_t

b.       y_t = e^α x_t^βe^ut

c.       y_t = α + βγ x_t + u_t

d.      ln(y_t) = α + β ln(x_t) + u_t

e.       y_t = α + βx_tz_t + u_t