How would a Partner user update the Work Order record from a mobile Device?

Universal Containers has a Partner Community. Work Orders are assigned to these partners. Partners are not interacting with Service Appointments or Service Resources.

How would a Partner user update the Work Order record from a mobile Device?
A . Field service mobile app
B . Salesforce mobile app
C . Work Order records cannot be updated on a mobile device
D . Salesforce Touch

Answer: B