11 如圖振幅限制器（Limiter）電路，U1 為理想運算放大器，假設二極體導通電壓 VD0 = 0.7 V。已知V = 15 V、R1 = 40 kΩ、Rf = 60 kΩ、R2 = 9 kΩ、R3 = 3 kΩ、R4 = 3 kΩ、R5 = 9 kΩ。對於輸出與輸入電壓之間的轉移特性，下列曲線何者較正確？  
(A)  
(B)  
(C)  
(D)