How quickly did the University of Oxford start developing an Ebola vaccine after learning about the outbreak?

The University of Oxford has already vaccinated its first clinical-trial participant.

• Option 1: They started relatively quickly after being alerted,
• Option 2: Shortly after becoming aware of the outbreak.
• Option 3: Very soon in response to a real emergency.
• Option 4: It took them a long time to develop and test an Ebola vaccine.