Did I format correct for Entware on Asus ac68u router? Ext2 vs Ext3 and Ext4

I have a Asus ac68u ac1900 router and I formatted my usb ext2. I formatted 1 partition for "Entware" and 1 for "Ab solution" and another "data" is this the best option besides formatting it ext2 or ext4? should I reformat it?

Also should I just do 1 partition?