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