What is a "Single Sign$-$On $($SSO$)$ token"?

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A "SSO token" is a token that represents or asserts the logged in user's "identity" & can be used to gain access to multiple applications$/$systems participating in the SSO mechanism without need to re$-$login with user's actual identifier$/$identity like user id ans password.

It is the token one has to use to do any transaction at a bank counter.

A SSO token is nothing but concatenation of user id and password.

All of the above

None of the above