Parity of Sums and Products

2. a, b, c, d pozitif doğal sayılar olmak üzere kısa kenarı a cm, uzun kenarı b cm olan dikdörtgen şeklindeki yeşil levhalar ile kısa kenarı c, uzun kenarı d cm olan mor levhalar şekilde gösterilmiştir. Buna göre, aşağıdaki ifadelerden hangisinin sonucu daima çift sayıdır? A) b + d B) c.d C) a + c

Soruda görsel içerik var: The image shows two arrangements of rectangles. In the top arrangement, four green rectangles (short side 'a', long side 'b') are placed horizontally in a row, followed by two purple rectangles (short side 'c', long side 'd') placed vertically on the right. The combined height of the horizontal green row plus the short side of a purple rectangle equals the vertical height of the stacked purple rectangles. The total width of the green rectangles equals the total width of the arrangement. In the bottom arrangement, the pattern is mirrored/inverted with purple rectangles forming a base and a green one on the right. The dashed vertical lines indicate the alignment of the total width for both configurations, demonstrating equality between expressions involving a, b, c, and d.