Read the following context and choose the best option to answer the question.
Context: Yesterday was no exception . When I arrived inside the airport in front of the United ticket counter area , the first thing I noticed was that the Premier Executive line was closed off . Normally there are United employees out front directing passengers . This time there were none .
Question: Why was the premier executive line closed off ?
Options: 
- United employee service has risen .
 - United employee service has not skipped a beat . .
 - None of the above choices .
 - There may be a strike taking place .


There may be a strike taking place .