Which class property is set twice with different value types?

In the class method i.e set_extensions($extensions), $extensions can either be a string containing one extension type, or an array containing many extension types.

By default, osCommerce saves all uploaded image files to the images folder.

When will you set E-mail Linefeeds to CRLF?

By default, osCommerce saves all uploaded image files to the images folder.

How will you fix the fatal class error as shown in the picture?

What is the use of the pink circle button in the products list in the given picture?

In the picture, which transaction mode for the PSiGate service would you choose when you decide to go live?

After looking at the picture, what do you understand by the maximum number of downloads option in the download section?

As shown in the picture, why is it recommended that you leave the setting as Image Required true while you are building the site?

When will you set the Use MIME HTML While Sending Emails feature to false?