
Explanation

Note: A round trip occurs when an object is deserialized and re-serialized in one operation.
From scenario: The application will provide users with the ability to search for a car by using advanced
filtering options, such as the car brand, model, year, and price. All of this information will be stored as strings
and will be displayed as drop-down lists.
The brand and model lists that will be displayed on the home page of the web application will be retrieved
from Windows Communication Foundation (WCF) services hosted in the on-premises environment.
Target 1: Task<String>
Though Performance blocking and Sluggishness are the tailbacks for any application, we can easily overcome
these bottlenecks by using asynchronous programming. But old-style practice for asynchronous programming
is not way easy enou
Target 2: Task<String>
Target 3: String
Target 4: String
References: https://rashimuddin.wordpress.com/2013/05/07/task-based-asynchronous-operation-in-wcf/