Question: Which choice is not a valid transition?

1. `transition: margin 1000ms ease-in-out;`
2. `transition: color 1.3s ease-in;`
3. `transition: position 400ms linear;`
4. `transition: opacity 1s ease-in;`

Answer: The correct answer of the above question is Option A:`transition: margin 1000ms ease-in-out;`