...in a "linking" table?

T1
----------
Id--Name
1 -- xav
2 -- fab

T2
----------
Id--Surname
1 -- bern
2 -- mac

LinkingT (or what else is its name :))
----------
Id -- IdT1 -- IdT2
1 -- 1-------1
2 -- 1-------2
3 -- 2-------1


Is it better on LinkingT :

1) Build clustered Index on IdT1 and NON CLUSTERED Indexes on other two col?
2) Build clustered Index on IdT2 and NON CLUSTERED Indexes on other two col?
3) Build clustered Index on Id and NON CLUSTERED Indexes on other two col?

any help appreciated.

regards

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fabriZio