Which of the following is not true about RStudio's working directory?

Select one:

a$.$ When reading or writing a file, if you write the file name without a specific folder path, the file must exist in the working directory to prevent errors.

b$.$ If you want to set up a new working directory, click the Session $>$ Set Working Directory $>$ Choose Directory $...$

c$.$ When a user executes a command to read or write a file, R assumes that the file is in the working directory.

d$.$ If you want to check the current working directory, you can run the setwd$()$ function in the console window.