Answer:
Clara should use computer lenses and artifical tears.
The computer lenses help block blue light from entering your eyes which would help with the headaches and help you focus on something further away. The artificial tears help lubricate dry eyes which prevents or in Clara's case, reduces/relieves eye strain.
Answer:
the mistake is in the first statement.
Explanation:
Now lets us put the statement into consideration:
"The sum of any two rational numbers is irrational"
The negation is: " there exists a pair of rational numbers whose sum is irrational". (Existence of at least one of such a pair).
The negation is not "the sum of any two rational numbers is irrational"
Therefore the mistake is in the first statement and it is due to incorrect negation of the proof.
is defined as the condition in which all of the data in the database are consistent with the real-world events and conditions.

Answer:
B
Explanation:
This feels like an error on the question issuer's part.
Various number of servers placed in racks are related to Rack servers in data center.
Explanation:
In data center commonly used server is Rack servers. Servers are being arranged in the mounted racks are generally called as rack servers in the data center. Internal fans are being fitted inside the racks make the servers to make a good airflow and maintain the cooling. There are different types of racks available the user can choose based on their requirement.