Which of the following statements is true regarding the instruction "SUBS R$1,$ R$2,$ R$3,$ RRX$"$

The instruction is invalid because there should be no $\text{'},\text{'}$ between $"$R$3"$ and $"$RRX$".$ The correct one could be "SUBS R$1,$ R$2,$ R$3$ RRX$".$

The instruction is valid, and after this instruction is executed, $[$C$]$ in APSR will be updated according to whether there is a borrow$-$in in the most significant column of the subtraction operation $($i$.$e$.,1$ if there is not a borrow$-$in or $0$ if there is a borrow$-$in$).$

The instruction is valid, and $"$R$2,$ R$3,$ RRX$"$ is the operand$2$ part of this instruction.

The instruction is valid, and after this instruction is executed, $[$C$]$ in APSR will be updated to be equal to the last bit being rotated out during the operation of rotating $[$R$2]$ right extended by $1$ bit.