From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be president of', Sentence: 'On Tuesday , November 4 , 2008 at about 8pm Pacfic Time , the major news networks officially called the election for the President of the United States of America for Democratic Candidate Barack Obama .'
President

Given Relationship: 'join', Sentence: 'Football star David Beckham will remain in Italy after joining AC Milan while his wife Victoria will stay back in Los Angeles with their three ...'
joining

Given Relationship: 'be develop by', Sentence: 'Developed by Netscape Communications Corporation , SSL version 3.0 was released in 1996 , which later served as a basis to develop TLS version 1.0, an IETF standard Communications protocol first defined in RFC 2246 .'

develop