VFP9SP2 free table

I've got a table with this structure:

city c(30)
state c(2)
radius i
distance i

My query is looking for city, state, and radius, to get back those whose distance is <= InputParameter.

select *
  from MyTable
 where city = m.tcCity and state = m.tcState and radius <= m.tiRadius

Not sure if I should
index on city tag city
index on state tag state
index on radius tag radius

or

index on city + state + padl(allt(str(radius)),6,'0') tag MyTag

???

I know I can use SYS(3054) to get my answer but I'm getting ready to be away from the office for a bit and was hoping someone knew the obvious answer. Otherwise I'll run my testing later tonight.

(At the very least, hopefully somebody learned about SYS(3054,x,y) today.)

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