Which of the following statements is CORRECT regarding to the bonding in the anionic part of `Na_(2)B_(2)O_(4)(OH)_(4)?`
A. both boron atom are `sp^(3)` hybridised
B. Two peroxy linkages are present
C. one boron is `sp^(2)` hybridised and other is `sp^(3)` hybridised
D. oxidation state of boron is +3
