Final answer:
The keywords for mobile approval or rejection of quotes are commonly found in the Submit sub-action - Approve and Submit sub-action - Reject configurations of the mobile platform used for approval workflows.
Step-by-step explanation:
The keywords for mobile approval or rejection of quotes when setting up approvals are typically defined in the workflow associated with the mobile application or platform used for approving or rejecting quotes.
Specifically, these keywords are often found in the settings for actions that a user can take within the mobile platform related to approval workflows.
The most common locations for these keywords would be within the Submit sub-action - Approve and Submit sub-action - Reject configurations.
While 'Submit for Approval' may trigger the process, it typically would not contain the approval or rejection keywords, and the 'Mobile Approval Email Notification' would be the medium to inform users of the actions to take rather than the location where keywords are defined.
Therefore, the correct answer is A. Submit sub-action - Approve.