How Many Of The Following Can Be Contained In Constantsp Pre I #340

How many of the following can be contained in constants?</p> <pre><code class="language-text"> i) boolean ii) integer iii) float iv) string </code></pre>

This multiple choice question (MCQ) is related to the book/course gs gs107 PHP: Hypertext Preprocessor. It can also be found in gs gs107 Objects and Databases - PHP Object Advanced Features - Quiz No.1.

 i) boolean ii) integer iii) float iv)  string