A broken copper strand in a circuit is known as which of the following?

Which element of the list does not have a unique predecessor?

a. the head of the list b. the tail of the list c. the middle element of the list d. all have unique predecessors

What cloud service model involves providing applications through an online user interface, providing for compatibility with a multitude of different operating systems and devices?

a. IaaS b. SaaS c. XaaS d. PaaS