What is the relationship between 'Warren East' and 'Rolls-Royce' in the context of the input sentence.
Options: position held, employer, distribution format, chief executive officer

* New Rolls-Royce boss Warren East faces £2bn headache in first week Meanwhile, Land Securities (LSE: LAND.L - news ) made strides on Tuesday - up 20p, or 1.6pc, to £12.50 after UBS (NYSEArca: FBGX - news ) lifted its rating to 'buy’ from 'neutral’, believing the stock is trading at a discount.
employer