I am erasing the HD on my iMac using apple's checklist. I am giving it away so want it wiped clean of info. When I choose the HD and erase, it asks me for a format, what format do I use?

I am giving away my old iMac, and am using Apple's checklist to erase the HD and reinstall the OS.

When I choose the HD and erase, it asks me for a format. Which format do I choose?

options are:

APFS, APFS ENCRYPTED

APFS CASE SENSITIVE,

APFS ENCRYPTED,CASE SENSITIVE

MAC OS EXTENDED JOURNALED

MAC OS EXTENDED, JOURNALED, ENCRYTED

MAC OS EXTENDED CASE SENSITIVE JOURNALED

MAC OS EXTENDED CASE SENSITIVE JOURNALED ENCRYPTED

EXFAT

MS-DOS FAT