what is the definition of Network?

It is simple and updates information

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1What key is used to link tables together, to create a relationship?
1. AForeign key
2. BPrimary key
2Primary key allows you to be recognised
1. AVerdadero
2. BFalso
3what is the definition of Network?
1. AIt is simple and updates information
2. BMore than one person uses it
3. COne person uses it
4what is the definition?checks the data isn't too short or too long
1. ASpell check
2. BPresence check
3. CLength check
5How many relationships are there?
1. A1
2. B2
3. C3