A call center has four agents:

Agent 1 has experience with Sales and French.

Agent 2 has experience with Sales and English.

Agent 3 has experience with Support and English.

Agent 4 has experience with Sales and is bilingual in English and French

The first call comes in requiring sales assistance in English and a second call comes looking for Sales in French.

Which agent is still available for calls when the call center is using Best Service Routing and the next call requires French?