There will only be one option in most cases.
We are assuming you already copied all your data to an external backup, or to your new Mac, because the following steps will really erase your disk. We are erasing a 2014 MacBook Air running MacOS 10.12 Sierra, but the steps will be similar with any recent Mac. Steps may vary with different version of macOS, and hardware configurations but the general idea is the same. Just a few clicks and you’ll have your computer restored to factory settings in no time. Clearing the hard drive may seem confusing at first, especially for the average Mac user, but it’s not.
Hard Drive Eraser is the only software in the world that meets the NIAP EAL4+ certification which means it complies with most national and international wiping. World's most highly-certified wiping technology. In fact, you can run Hard Drive Eraser directly from a CD without even starting the operating system. Once you confirm the remote wipe action DriveStrike issues a secure push command that the Mac will execute. Remote Wipe your Mac hard drive using the DriveStrike Device page – click Wipe and you will be prompted to enter your credentials again to confirm the remote data erasure action.
Completely destroy and erase all existing data, deleted/lost data and traces on MacBook Pro Wipe your MacBook hard drive and files/folder data. The program includes powerful as well as fast wiping algorithms that can permanently erase everything from hard drive.