I would say it has to be b but its what the correct answer is its up to you!
I hoped this helped you out!
Have a nice day!
Answer: 3. HTML focuses on a web page's structure and CSS focuses on its presentation.
Explanation: HTML is designed to allow you to add the content and format it correctly. However, CSS's job is to allow for stylizing.
Answer:
The answer is "Referential integrity".
Explanation:
This relates to one aspect of data integrity. Data across multiple tables are linked via relationships. In view of the distinct customer & invoice tables, each invoice table should have the primary key specified throughout the Customer table, for instance. Whenever the invoice table contains a customer ID reference. This ID including its customer will be only a table of the customer.
I think that the answer is packets.