how many ledger groups to create with 4 ledgers?

Hello

We are using new GL in ECC 6.0. If I have 4 ledgers/accounting principles say A,B,C,D. How many ledger groups do I need to set up to allow business to select the right number of ledgers to post to?

4 ledger groups with only 1 ledger assigned: A, B, C, D

3 ledger groups with only 3 ledgers assigned: ABC, BCD, ACD

6 ledger groups with 2 ledgers assigned: AB, BC, CD, AD, AC, BD

1 ledger group with 4 ledgers assigned: ABCD

In total 14 ledger groups?

regards

Arjan