Accessing a third-party REST service inside a Spring application.

The correct answer is A. resttemplate class.

The RestTemplate class is a high-level REST client that provides a synchronous API for accessing RESTful web services. It is a convenient way to send HTTP requests and receive responses.

The ViewResolver class is a Spring MVC interface that is responsible for resolving view names to view objects. The InternalResourceViewResolver class is a concrete implementation of the ViewResolver interface that resolves view names to internal resource views. The View class is an interface that represents a view in Spring MVC.

To access a third-party REST service inside a Spring application, you can use the RestTemplate class. The following code snippet shows how to use the RestTemplate class to send a GET request to a third-party REST service:

RestTemplate restTemplate = new RestTemplate();
String response = restTemplate.getForObject("https://example.com/api/v1/users", String.class);

The response object will contain the response from the third-party REST service.