Server 2012 R2 on ML310e

[PCJEdi]

I have a HP Proliant ML310e Gen8 v2 Server with a B120i RAID Controller.   There are 4 2TB hot swap SATA 6Gb/s 7200 rpm drives.   I am configuring the RAID 1+0 for the system.   This server will be domain controller. 

Strip Size: 256 KiB

Full Stripe Size: 512 KiB

Sectors/Track: 32

Max Size: 3.6 TiB

Caching Enabled

I have the options of either

1. Max for MBR Partiion Table (2097152) MiB (2 TiB)

2. Maximum Size 3815394 (3.6 TiB)

3. Custom Size

What size should I set for the server as a Domain Controller.

Stephen Hopkins, Computer Help