Answer:
A. Request timeout.
Explanation:
The end devices like the computer systems in a network seeks to share resources with one another and/ or request resources from central server.
With this, there are two ways computers in a network can communicate. They are peer to peer network communication and client-server network communication.
The client-server communication requires a dedicated central server where computers in the network require data. Peer to peer describes a network where computers serve as both client and server to each other.
Request timeout is a message sent to a source when the time to live period (TTL) of a packet expires.
There are some function which can be performed with database but not with a spread sheet, these functions include:
1. Enforcement of data type.
2. Support for self documentation.
3. Defining the relationship among constraints in order to ensure consistency of data.
Answer:
See explaination for the details of the answer.
Explanation:
A class is a structured diagram that describes the structure of the system.
It consists of class name, attributes, methods and responsibilities.
A mailbox and an email message has some certain attributes such as, compose, reply, draft, inbox, etc.
See attachment for the Model object classes that might be used in the system implementation to represent a mailbox and an email message.
