A symmetrical square wave of frequency 25 kHz and a peak-to-peak amplitude of 10 V is fed to Y-input of a single channel oscilloscope. The screen appears as shown in figure. Then the X and Y sensitivities and the trigger settings respectively are

• A. 5 μs/cm, 2 V/cm and +ve slope
• B. 5 μs/cm, 2 V/cm and -ve slope
• C. 10 μs/cm, 1 V/cm and +ve slope
• D. 20 μs/cm, 2 V/cm and -ve slope