Final answer:
Haydn in his later career focused on composing string quartets and chamber music. He was employed by the Esterházy family and also lived in London for a period of time.
Step-by-step explanation:
Haydn, a composer of the Classical period, is known for his contributions to various musical forms such as symphonies, concertos, sonatas, and operas. In his later career, he focused more on composing string quartets and other chamber music.
Among the statements given, the true statements about Haydn in his later career are:
- b) He was employed by the Esterházy family: Haydn served as the court composer for the Esterházy family for a significant part of his career.
- c) He lived in London for a period: Haydn spent two extended trips to London, where he composed and performed for the English audiences.
- d) He was a prolific composer of string quartets: Haydn composed numerous string quartets, contributing greatly to the development of this genre.