What do the os$.$getcwd$()$ and os$.$chdir$()$ functions do$?$

Question $49$ options:

Both functions return a list of files in the current directory.

getcwd$()$ changes the current directory, and chdir$()$ retrieves the current directory.

Both functions change the current working directory.

getcwd$()$ retrieves the current directory, and chdir$()$ changes the current directory.