What will come in the place of question mark (?) in the

Bus topology is also known by which one of the alternative names below?

Which of the following is NOT a type of firewall? 

What is the primary advantage of using an Object-Oriented Programming approach?

What is "serverless computing"?

Which protocol is commonly used for secure data transfer in cloud computing?

In C++, what mechanism is primarily used to achieve runtime polymorphism?

If receiver noise floor is 2 dB, signal-to-noise ratio is 3 dB then what is the receiver sensitivity?

Consider the following Java code snippet:

    import java.util.ArrayList;

    import java.util.Arrays;

Which data structure is most commonly used to efficiently implement a priority queue?

In pandas, what does df.groupby('A').agg({'B': 'sum', 'C': 'mean'}) return?