Answer:
4)They can be easier to access.
Step-by-step explanation:
An online resource is a source of information such as web pages or documents that we can find browsing the internet. As you can imagine, the advantage of using this type of resources is their availability, if you have good research skills you can find information from almost every topic and from any place you want. Unlike written documents, you don't need to go physicaly to a special place to get the information. The only tools you need are a computer or cellphone and acces to internet.
It's important to say that the main problem of this type of resources is their origin, we must be alert and cautious as it's easy to find fake or deviated information.