Explanation:

- To determine which symbols can be placed in the blank spaces, we need to interpret each statement based on the given definitions.

- The condition M@W means M is greater than W. Thus, we need to ensure that the expression ultimately shows M is greater than W.

- The condition "Either W&N or W#N is true" means either W equals N or W is smaller than N.

- Let's analyze Option 4: &, $, #, *:

- W&H (W = H) is true.

- N$B (N is not smaller than B) is correct.

- W#N (W is smaller than N) is true.

- B*M (B is not greater than M) is correct.

- This satisfies all conditions: M is greater than W and W is either equal to N or smaller than N.

- ? Option 4 is the correct answer.