What's the best way to powerlevel a team of 5?

[Undeadlord]

I have two questions,

Question 1: What awards the most experience from the below options when boosting a "single" character:

1. Leveling a 4-man team with an 60 mage through dungeons

2. Leveling a 2-man team with an 60 mage through dungeons

3. Leveling a 4-man team with an 60 mage through dungeons where the 3 alts of the team are dead

4. Leveling a 2-man team with an 60 mage through dungeons where the 1 alt of the team is dead

5. Leveling the alt alone with an 60 mage through dungeons

I kinda know how it works outdoors, bring a support 60lvl character or mass pull with an 60 and aoe with alt (I guess only if its mage class)

Question 2: What are the best spots for tag leveling at 48+?

A lot speak about tag leveling when the alt can tag 48+ level mobs because they are green to 60s. What are the best spots to level a 5-man team like this? is it better than running them to ST & BRD?

Does the hyperspawn list includes these hotspots at 48+?

I would prefer this method for teams who can't handle dungeons due to weak aoe. You can powerlevel a team up to 46 or so, SM cath & Maraudon can be done in 1 pull so it's very possible now. I don't know if they will nerf it.