What is the purpose of "rb" in fopen() function used below in the code? FILE *fp; fp = fopen("source.txt", "rb");

What is the purpose of "rb" in fopen() function used below in the code?

FILE *fp;
fp = fopen("source.txt", "rb");

[A].	open "source.txt" in binary mode for reading
[B].	open "source.txt" in binary mode for reading and writing
[C].	Create a new file "source.txt" for reading and writing
[D].	None of above

Answer: Option A

Explanation:

The file source.txt will be opened in the binary mode.