How do I determine which version of Cake is on my system?

Need Help
1

I inherited a legacy app that is using Cake. It now needs to be updated but I have no idea what version of Cake is used.

TIA

2

if its older (1.x or 2.x) it should have VERSION.txt in /cake or /lib/Cake

3

or just run bin/cake and it tell you the exact version