If '+' represents addition, '-' represents subtraction, '×' represents multiplication, and '÷' represents division, what is the value of 8 ÷ 2 × 4 + 6 - 3?
From the set of items: X, Y, Z, A, and B, the following conditions are given: 1) X cannot be selected if Y is selected. 2) Z must be included if A is selected. 3) B can be included regardless of the others. Which selection is valid?