Determine Whether the Given Argument Is Valid or Invalid C) Invalid

Multiple Choice

determine whether the given argument is valid or invalid. If it is invalid, select a counterexample.
-1. (?x) (Gx ? Hx)
2) (?x) (Gx • Ix)
3) (?x) (Gx • Jx)
4) (?x) (Jx ? Hx) / (?x) (Ix • Jx)

A) Valid
B) Invalid. Counterexample in a domain of 1 member, in which:
$$\begin{array} { l l l l } \text { Ga: True } & \text { Ha: True } & \text { Ia: True } & \text { Ja: True } \\\text { Gb: True} &\text { Hb: True } &\text {Ib: True }&\text { Jb: True } \\\end{array}$$
C) Invalid. Counterexample in a domain of 1 member, in which:
$$\begin{array} { l l l l } \text { Ga: False } & \text { Ha: True } & \text { Ia: True } & \text { Ja: True } \\\text { Gb: True} &\text { Hb: True } &\text {Ib: True }&\text { Jb: False } \\\end{array}$$
D) Invalid. Counterexample in a domain of 1 member, in which:
$$\begin{array} { l l l l } \text { Ga: True } & \text { Ha: True } & \text { Ia: True } & \text { Ja: True } \\\text { Gb: True} &\text { Hb: True } &\text {Ib: True }&\text { Jb: False } \\\end{array}$$
E) Invalid. Counterexample in a domain of 1 member, in which:
$$\begin{array} { l l l l } \text { Ga: False } & \text { Ha: True } & \text { Ia: False } & \text { Ja: False } \\\text { Gb: False } &\text { Hb: True } &\text {Ib: True }&\text { Jb: False } \\\end{array}$$