Honestly , brainly may seem like a place to get answers but it’s not , people come here to troll, like me
Answer:
A key field is used to uniquely identify each record for retrieval or manipulation.
Explanation:
In a database there are many, having similar entities. So in order to differentiate each entity from other we need to set a key field among all the field which is always unique for each entity.
For example:
In a database of a company having data about its employees, the key field might be their ID. As some employees can have same names, addresses, phone numbers but cannot have the same ID.
Sort ascending would be the correct one, since you are going from the lowest value to the highest
Explanation:
the output of your code is 30
The answer to this is C :D
