What command can be used to concatenate two files into a new one?

The command that correctly concatenates two files into a new one is comprised of the cat utility followed by the names of the two files you want to combine, and then the output redirection operator (>), which specifies the name of the new file where the combined content should be written.

Using cat file1 file2 > newfile will take the contents of file1 and file2, concatenate them in the order specified, and redirect the combined contents to newfile. This operation effectively merges the files into one new file, maintaining the content of each file in the output.

In contrast, the other options contain commands or syntax that are not valid for combining files in this manner. The use of combine and merge are not standard commands in most Linux distributions for file concatenation, and the syntax using + is incorrect; cat requires simply a space between the file names to function as intended. Thus, the proper usage of the cat command makes it the suitable choice for this task.