Which actor played James Bond the most times in the official Eon series, with seven films?

Who played Wolverine in the 'X-Men' films? Who played Deadpool in the 2016 film? Who played Harley Quinn in 'Suicide Squad' (2016)? Which actor played James Bond in 'Dr. No', the first Bond film? Which actor played James Bond in 'Casino Royale' (2006)? Which actor played James Bond in 'GoldenEye' (1995)? Which actor played James Bond only once, in 'On Her Majesty's Secret Service'? What is the name of James Bond's boss, known by a single letter?