#notation

Question 1: Single choice

For trip $i$ the observed travel time is 7 minutes and the model predicts 5 minutes. Which statement uses the usual notation correctly?

$y_i = 7$ , $\hat y_i = 5$ , and $\theta$ collects the weights and biases of the model1
$y_i = 5$ , $\hat y_i = 7$ , and $\theta$ collects the weights and biases of the model2
$x_i = 7$ , $y_i = 5$ , and $\theta$ stands for the learning rate3
$y_i = 7$ , $\hat y_i = 5$ , and $\theta$ stands for the number of examples4