Table:
text: Bangladesh Navy
D & R
D & R
Serial_Branch Seaman Mechanical Secretariat Supply Electrical Radio_Electrical Regulating Medical
1 OD ( Ordinary Seaman ) ME II WTR II SA II EN II REN II PM II MA II
2 AB ( Able Seaman ) ME I WTR I SA I EN I REN I PM I MA I
3 LS ( Leading Seaman ) LME LWTR LSA LEN LREN LPM LMA
4 PO ( Petty Officer ) ERA-IV PO(W) PO(S) EA-IV REA-IV PO(R) PO(Med)
5 CPO ( Chief Petty Officer ) ERA-I/II/III CPO(W) CPO(S) EA-I/II/III REA-I/II/III CPO(REG) CPO(Med)
6 SCPO ( Senior Chief Petty Officer ) SCPO(E),CERA SCPO(W) SCPO(S) SCPO(L),CEA SCPO(R),CREA SCPO(Reg) SCPO(Med)

Question: How many serial branches of Bangladesh Navy have radio electrial = rea-iv ?

Question: What are radio electrics when the secretariat is in the Bangladesh Navy?

Question: What are Electrics in which Bangladesh Navy Secretariat operates?

Question: What mechanical LPM regulation does the Bangladesh Navy have?

Question: Who regulates Radio Electric = lren at the Bangladesh Navy?