Which of the following is true about web services?
a - web services are open standard xml, soap, httpetc. based web applications.
b - web services interact with other web applications for the purpose of exchanging data.
c - web services can convert your existing applications into web-applications.
d - all of the above

The answer is "Option D".

Explanation:

Web service is also known as an online open software product, which uses a common XML messaging service system. It is used service like HTTP, SOAP, etc, that encrypts messages from all web services.

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)