Which of the following first-order sentences that hold in the graph where E denotes the graph edges? := Vx 3y E(x, y) 42 := Vx 3y E(y, x) 93 := Vx 3y (E(x, y) → E(y, x)) P4 := Væ Vy 32 ((E(x, y) ^...

Which of the following first order sentences that hold in the graph where E denotes the graph edges?

Extracted text: Which of the following first-order sentences that hold in the graph where E denotes the graph edges? := Vx 3y E(x, y) 42 := Vx 3y E(y, x) 93 := Vx 3y (E(x, y) → E(y, x)) P4 := Væ Vy 32 ((E(x, y) ^ E(y, z)) + E(r, z)) There may be multiple answers or none for this question. You just need to write down which of the formulas hold. You do not need to explain it.