Which of the following is true about reading and writing files using MATLAB?

		The dlmread function cannot function unless a delimiter is explicitly specified.
		In newer MATLAB versions, the writematrix and readmatrix can used instead of dlmwrite and dlmread.
		The default delimiter in a dlmwrite function is a semicolon.
		The dlmwrite and dlmread functions can be used to write and read data files using MATLAB.