4. For each month of the year, count how many files in the /bin directory have a timestamp for that month Note 1: Perform the counts for all the months using a single command Note 2: The length of a month name in a timestamp is exactly three (3) letters. Note 3: Linux is case-sensitive (Jan is not equal to jan) Note 4: The output of the command should match the following format exactly: Jan: x Feb: x Mar: x