Which of the following is the function of resource pooling?

Question $19$ options:

Customer is able to manage resources remotely and automatically without the need to contact CSP$.$

Sharing of the provider's physical and virtual resources among multiple customers.

Enables pay$-$as$-$you$-$go feature by providing a complete report of resource usage for both provider and customers.

Customer access to capabilities through the network and by the standard mechanism.