Which of the following are correct statements about web services? More than one answer may be selected.

Web services are a set of software technologies that are able to exchange information with each other using standardized web communication protocols and languages.

Web services can be used to create apps that link different systems of different organizations and to build open$-$standard based web applications.

HTTP is commonly used to create web services.

Web services allow for the exchange of information between two systems and are not tied to any one operating system or programming language.