What output will the following command sequence produce? echo '1 2 3 4 5 6' | while read a b c; do echo result: $c $b $a; done

The echo '1 2 3 4 5 6' command pipes the string '1 2 3 4 5 6' to the while read a b c loop. The read command assigns '1' to variable a, '2' to variable b, and then assigns all remaining words ('3 4 5 6') to variable c. The echo result: $c $b $a command then prints 'result: 3 4 5 6 2 1'. The loop executes only once as there is only one line of input.

This would be the output if echo result: $a $b $c was used, or if read assigned all words to a single variable.

This output incorrectly truncates the input and also incorrectly reverses the segments.

This implies that each word was read individually and then reversed, which is not how read with multiple variables behaves for a single line of input.

This output incorrectly truncates and reverses the segments.