Which of the following command Mason should run in Knoppix to permanently erase the data?

Mason is the network administrator of ata Machine Systems, Inc. He has been pushed aside in promotions due to office politics. He wants to take revenge on his oss, Matthew Smith. Being a disgruntled employee, Mason sneaks into Matthew’s office one night and boots his boss’s computer with the Knoppix CD-ROM and intends to erase the contents of his oss’s hard disk including the partition table without leaving any trace of his action. He intends to make the hard disk data unrecoverable even to forensics team.
Which of the following command Mason should run in Knoppix to permanently erase the data?

A.
$ delete -fik /dev/hda1

B.
$ wipe -fik /dev/hda1

C.
$ erase -fik /dev/hda1

D.
$ secdel -fik /dev/hda1