Operating system course Please choose the right answer

How can you display a list of all files, including the hidden files? * O Ls O Find -a O Ls-a O Ls -al what occurs when memory is divided into variable size partitions based on the size of processes. * O Internal fragmentation Both O External fragmentation O nothing Let a =5, b = 6. Choose the proper command to perform multiplication? * O expr $a * $b O $(a*b) O expr $a |* $b O None of the above. How can you append the output of a command to a file? * O Command >> file O Command file Command file