The following PHP call fails to establish a database connection. Which of the listed options is the most common cause of this failure?
PHP
$conn = mysqli_connect("localhost", "root", "", "db");

Question

The following PHP call fails to establish a database connection. Which of the listed options is the most common cause of this failure? 
 PHP 
 $conn = mysqli_connect("localhost", "root", "", "db");

Answer

A missing echo statement before the call.

Answer

Incorrect credentials (wrong username, password, or database name).

Answer

A PHP syntax error elsewhere in the script.

Answer

The code should use single quotation marks instead of double quotation marks.

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The following PHP call fails to establish a database connection. Which of the li...

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