For example %Listing 8-2, what does while ~isempty( ln ) mean ?fn = input( 'file name: ' , 's' );fh = fopen( fn, 'r' );ln = '';while ischar( ln ) ln = fgetl( fh ); if ischar( ln ) ca = []; while ~isempty( ln ) [tk, ln] = strtok( ln ); ca = [ca {tk}]; end disp( ca ); end endfclose( fh );Question options:Read the whole line including the new-line characterWhen the file read reaches the end of file, the reading function return -1 instead of a stringThe tokenizer will be finished when it leaves an empty line as the resultKeep reading and make sure there is a line to process

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