b) Detect Magic/Read Magic/Identify
I think ill go with this one. Note that the abilities increase as the Setting increases. Example
Setting 0 of Disc 6
Wearer gains the following bonus feats, depending upon the Setting of Disc 1.
0: No bonus feats
1-3: Armor Proficiency (light)
4-6: Armor Proficiency (light, medium)7-10: Armor Proficiency (light, medium and heavy)
Setting 10 of Disc 6
Wearer gains the following bonus feats, depending upon the Setting of Disc 10.
0: No bonus feats
1-3: Mounted Combat and Mounted Archery
4-6: Mounted Combat, Mounted Archery, Trample and Ride-By Attack
7-10: Mounted Combat, Mounted Archery, Trample, Ride-By Attack and Spirited Charge.
Just to show, the Setting 10 is far more powerful.
Setting 10 on the Spell-like abilities is Limited Wish / Symbol / Wish (only once a week though)