A) two \[B{{O}_{4}}\] groups and two \[B{{O}_{3}}\] groups
B) \[N{{a}_{2}}{{B}_{4}}{{O}_{2}},\,\,10{{H}_{2}}O\] \[\{N{{a}_{2}}[{{B}_{4}}{{O}_{5}}{{(OH)}_{4}}]\,8{{H}_{2}}O\}\] four \[B{{O}_{4}}\] groups only
C) four \[B{{O}_{3}}\] groups only
D) three \[B{{O}_{4}}\] and one \[B{{O}_{3}}\] groups
Correct Answer: A
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