Answer:
A. data-link layer
Explanation:
Data-link layer is the first layer and allows a contiguous sequence of bits to be transmitted through the network.
On top of it is the Network Layer and it handles the task of routing network messages from one computer to another.
Then comes the Transport Layer which is the basic layer at which one network computer communicates with another network computer.
They have a chance of being blocked
Answer:
The expression is :
π[cd) + π(g,h) ],[π(e,f)+π(a,b)])
We will use foreign key and primary key
The steps I would take are 1. Making a strong password with symbols and numbers. 2. I will set up a 2 way authentication ther for if someone would be trying to hack me I would get an alert in order to stop the attempt. 3 I will not use the same password each time.
