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### How to find version number of CAS used by sage

Hello. sagemath newbie here.

When I type

r=integrate(sqrt(x),x,algorithm="sympy")


or

 r=integrate(sqrt(x),x,algorithm="fricas")


or

 r=integrate(sqrt(x),x,algorithm="maxima")


etc..

what command to use to find what version numbers of those CAS it is using? For Fricas, I just installed it, so I know it is 1.3.3-1, But in general, how does one ask sage to provide this information? Is there a command to use?

Will these be the same obtained on the bash command line when doing

 $which maxima$which fricas


If that is the case, then I can find the version numbers easily. But what about sympy? How do I know which sympy sage is using to make sure.

Thank you,

--Nasser