Q: When building a neural network model to predict house prices which activation function is commonly used in the output layer?

A$.$ ReLu

B$.$ Tanh

C$.$ Softmax

D$.$ no activation function is needed

Q: In K$-$means clustering, what is the purpose of the "elbow method"?

A$.$ To determine the optimal number of clusters

B$.$ To identify the best distance metric

C$.$ To select the best initialization method

D$.$ To determine the convergence criteria