Answer:
Abstraction
Explanation: Abstraction is a software engineer terminology that has been found to be very effective and efficient especially as it relates to object-oriented computer programming. It has helped software engineers and other computer experts to effectively manage account objects without having a knowledge of the details with regards to the Implementation process of that account object.
Answer:
it means they can not make edits or changes to said folder
Explanation:
The "middle ages" are anything between the collapse of Rome (400 AD) to its re-emergence in Rennaissance Italy (1400). Rennaissance means "rebirth". The "dark ages" are the period in the middle ages which were relatively undocumented. This would definitely include 400 AD to 700 AD, and some extend it to 900 AD.
A composite primary key<span> is a set of several primary </span>keys<span> that, together, uniquely identifies each record.</span>
Primary keys are used as identifiers of composite entities. In this case each primary key combination is allowed only once in the *:* relationship.
Other case where primary keys are used is as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity.
