To run a Java class $"$a$.$b$.$P$"$ in folder $"$~$/$a$/$b$/$P$.$class", which is the correct command?

Question $9$ options:

$1)$

With $"$~$"$ being the working folder, run command "java a$.$b$.$P$"$

$2)$

With $"$~$"$ being the working folder, run command "java P$.$class"

$3)$

With $"$~$"$ being the working folder, run command "java a$/$b$/$P$"$

$4)$

With $"$~$"$ being the working folder, run command "java P$"$