About PHP Group and Zend

I'm sorry if this is the wrong contact address, I am learning to be a PHP developer, and can code myself although looking at the Zend Certified Engineer exam. It confused me on the FIRST question, it says the answer is: "PHP is a embedded scripting language based on the zend engine" I was under the belief that the scripting language was based on apache, and developed by PHP. Thanks Adam Hosker