In the Bitcoin system, different addresses from the same entity can be linked to the same $\_\_\_\_\_\_\_\_.$ If an output at a $\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ is spent together with one from any of the addresses in the cluster, then this new address can also be added to the cluster.

Question $2$ options:

blockchain, old address

cluster, new address

block, new address

node, address