Answer:
The correct options are 1 and 3.
Step-by-step explanation:
Let,
p: A shape is a triangle.
q: A shape has four sides.
It is given that the shape is a rectangle. It means q is true and p is false.
1. p ∨ q is true if and only if p is true, or q is true.
Here q is true, therefore this option is correct.
2. p ∧ q is true if and only if p is true and q is true.
Here p is false, therefore this option is incorrect.
3. p → q is true if and only if the p is false or q is true.
Here p is false and q is true, therefore this option is correct.
4. q → p is true if and only if the q is false or p is true.
Here p is false and q is true, therefore this option is incorrect.
Therefore the correct options are 1 and 3.