Explain different types of data dependency, consider the following assembly code

$1,$ADD R$1,$R$2,$R$3$

$R_1$

$1,$ SUB $R3,R2,RI$

$1,$MUL $R4,R$ I,$R2$

$L$:DIV $R3,R4,R3$

Find number $of$ data $ependenciesin$ the above code.