How to add and format two additional HDDs to linux server to maximize storage and make it robust?

I am building a home ubuntu server mainly file sharing. I have a 100G SSD drive in which I want to install the system, and I have two 4T HDDs that I want to use as mass storage and mounting point for users’ home directory. My question is what you all think it is the best way to format and combine the drives to primarily maximize storage and make it somewhat robust.

I am pretty sure I will use the SSD for the system files, so the question more specifically how to use the remaining two HDDs. I considered:

A) formatting each individually (ext4), and mounting them as two separate drives, and have one storing regular backups.
B) Merging those two HDDs using LVM to create a 8T VG.
C) same as B but with some RAID 0 (faster?) or RAID 1 (for added redundancy?)
D) Having one HDD as the main storage space formatted as LVM in case I want to expand it later, and having the second one as a standard partition to keep backups, cloud storage, non-important files, etc.