Which is the wrong statement ?
A. In ocymercuration and demercuration reaction, alcohol is formed by markovnikov addition.
B. In hydroboration oxidation reaction, alcohol is formed by anti`-` Markovnikov addition
C. Regiospecificity of `HBO` reaction is syn.
D. Regispecificity of oxymercuration and ddemersuraction reaction is anti and rearragement occurs.