<human>: Objective: how to find tyhe perimeter of a parellolgram

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- Perimeter = add the length of all sides    P = 2a + 2b
- Perimeter = add the length of all sides plus the height    P = 2a + 2b
<bot>: Perimeter = add the length of all sides    P = 2a + 2b