To open a file c:\ss.txt for appending data, we use

1. file = open("c:\\ss.txt", "a")
2. file = open("c:\\ss.txt", "rw")
3. file = open(r"c:\ss.txt", "a")
4. file = open(file = "c:\ss.txt", "w")
5. file = open(file = "c:\ss.txt", "w")
6. file = open("c:\res.txt")

To read the next line of the file from a file object infi, we use

1. infi.read(all)
2. infi.read()
3. infi.readline()
4. infi.readlines()

The readlines() method returns

1. str
2. a list of lines
3. a list of single characters
4. a list of integers

Which of the following mode will refer to binary data ?

1. r
2. w
3. +
4. b