What does the 'a+' file mode in Ruby signify?

A. Integer representing file descriptor B. Array of file contents C. Boolean value D. File object

A. File.create("filename.txt", "w") B. File.write("filename.txt", "w") C. File.open("filename.txt", "w") D. File.new("filename.txt", "w")

A. read B. readline C. getline D. None of the above

A. To delete all lines from a file B. To write all lines of a file from an array C. To read all lines of a file into an array D. To read a specific line from a file