### 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