The correct answer is D. All of the mentioned.
Online backup is the fastest way to recover data because it is stored on a server that is constantly connected to the internet. This means that you can access your data from anywhere in the world and recover it quickly in the event of a disaster.
Tape libraries are an example of nearline storage, which is a type of storage that is not as fast as online storage but is faster than offline storage. Nearline storage is typically used for data that is not accessed frequently but needs to be available quickly in the event of a disaster.
Offline backup is the slowest way to recover data because it is stored on a device that is not connected to the internet. This means that you need to physically access the device to recover your data, which can take hours or even days.
Here is a table that summarizes the different types of backup and their respective advantages and disadvantages:
| Type of backup | Advantages | Disadvantages |
| — | — | — |
| Online backup | Fastest recovery | Most expensive |
| Nearline backup | Less expensive than online backup | Slower recovery than online backup |
| Offline backup | Least expensive | Slowest recovery |
I hope this helps!