Final answer:
The team can use a rollback procedure to revert the system to its previous state after a system failure during new software patching. If necessary, they may also use a data backup. Therefore, both rollback procedures and data backups can restore the system.
Step-by-step explanation:
When an engineering team observes a system failure during the implementation of new software patching, from a conceptual standpoint, the team can use c. Rollback procedure. A rollback procedure is designed to revert the system back to its previous state before the new changes were applied. This helps ensure system stability and prevents the new patch from causing further issues.
In some cases, a data backup may also be used to restore the system to its original state, especially if the rollback procedures are unable to revert all the changes made by the new software patching. Hence, the correct answer is d. Both b and c, meaning both data backup and rollback procedure can be utilized to restore the system after a failure during software updates.