In the LC$-3$ ADD Instruction, bits b$11-$b$9$ is the $\_\_\_\_\_\_\_\_\_$ and belongs to the $\_\_\_\_\_\_\_\_\_\_$ of the instruction.

a$)$ SRC$1,$ Opcode

b$)$ SRC$1,$ Operands

c$)$ DEST, Operands

d$)$ SRC$2,$ Opcode