Question 4 1 pts Using numpy, which line of code would we use to make predictions, y_hat, from a linear regression model with model parameter (coefficient) np.array, w, and feature np.array, Phi? Note: You can assume that Phi is of shape (num_samples, num_features) and w is of shape (num_features, 1). y_hat = Phi @ w y_hat = Phi * w y_hat = W * Phi y_hat = W @ Phi