Which of the following commands will send output from the program myapp to both standard output (stdout) and the file file1.log?

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Which of the following commands will send output from the program myapp to both standard output (stdout) and the file file1.log?
A . cat < myapp | cat > file1.log
B . myapp 0>&1 | cat > file1.log
C . myapp | cat > file1.log
D . myapp | tee file1.log
E . tee myapp file1.log

Answer: D