Answer:
Option D i.e., {!$User.FirstName} is the correct answer.
Explanation:
The following option is correct because in the following statement, the user programmer will ask to display the first name by using the global variable then, in the PHP Programming Language the following is the correct way to display the first name of the user, which is inside the curly braces then, not operator and then, name of the variable through which it call.
