Answer:
because there might be a internet
problem
Explanation:
Since java.util.PriorityQueue doesn't use the Cloneable interface, I think it's safe to say that Serializable interfaces are implemented in all instances.
Answer:
b. Certificate Authority
Explanation:
Based on the information provided within the question it can be said that they are communicating with each other by using a certificate authority. This term refers to a company or organization that provides security verification by issuing both parties cryptographic keys which are specifically verified by the company in order to allow both parties to know exactly who they are communicating with.