how disccover which selenium and chromedriver is used during polymer test - selenium

Question

I get this error when running "Cannot establish new session" when I run "polymer test --skip-selenium-install"
error: [cli.main] Error: {"value":{"stacktrace":"org.openqa.selenium.SessionNotCreatedException: Cannot establish new session\nBuild info: version: \u00273.8.1\u0027, revisi
on: \u00276e95a6684b\u0027, time: \u00272017-12-01T19:05:32.194Z\u0027\nSystem info: host: \u0027WDU8L0001186\u0027, ip: \u002710.244.11.110\u0027, os.name: \u0027Windows 7\u0
027, os.arch: \u0027x86\u0027, os.version: \u00276.1\u0027, java.version: \u00271.8.0_172\u0027\nDriver info: driver.version: unknown\r\n\tat org.openqa.selenium.remote.server
.ServicedSession$Factory.apply(ServicedSession.java:261)\r\n\tat org.openqa.selenium.remote.server.ActiveSessionFactory.lambda$apply$11(ActiveSessionFactory.java:167)\r\n\tat
...
e":"Cannot establish new session\nBuild info: version: \u00273.8.1\u0027, revision: \u00276e95a6684b\u0027, time: \u00272017-12-01T19:05:32.194Z\u0027\nSystem info: host: \u00
27WDU8L0001186\u0027, ip: \u002710.244.11.110\u0027, os.name: \u0027Windows 7\u0027, os.arch: \u0027x86\u0027, os.version: \u00276.1\u0027, java.version: \u00271.8.0_172\u0027
\nDriver info: driver.version: unknown","error":"session not created"},"status":33}
at C:\Users\D-CA69TO\AppData\Roaming\npm\node_modules\polymer-cli\node_modules\web-component-tester\runner\steps.js:170:27
at Generator.next (<anonymous>)
at fulfilled (C:\Users\D-CA69TO\AppData\Roaming\npm\node_modules\polymer-cli\node_modules\web-component-tester\runner\steps.js:4:58)
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:188:7)
By googling around I saw that this might be caused by wrong combination of Selenium, ChromeDriver and Chrome. Well, my Chrome is Version 66.0.3359.117 (Official Build) (32-bit) but how can I check which is the Selenium and ChromeDriver been used? Honestly, I don't remenber I installed them so I assume polymer-cli did this for me somehow.
*** Edited after Corey's suggestion
C:\>chromedriver -v
'chromedriver' is not recognized as an internal or external command,
operable program or batch file.

Answer 1

to get the chromedriver version: chromedriver -v
if you have the selenium python bindings installed, you can check the version with: python -c "import selenium; print(selenium.__version__)"
for example, in a shell you can do:
$ chromedriver -v
ChromeDriver 2.36 (0)
$ python -c "import selenium; print(selenium.__version__)"
3.11.0