What data from the b$.$txt file does the readLine method return in the code that follows? Path p $=$ Paths.get$("$b$.$txt$")$; BufferedReader in $=$ new BufferedReader$($ new FileReader$($p$.$toFile$()))$; String line $=$ in$.$readLine$()$; Question $5$ options: a$)$ The first character in the file b$)$ The first line of the file c$)$ The entire file d$)$ The name of the file