In a Schmitt trigger using OP amplifiers the output is limited by diode clipper to V0 = 8 volts. The positive input terminal voltage V+ = V0, where = 1 / 8. The signal Vs is applied to V . The following statements (1) to (4) are made regarding Vs and V+ (1) For Vs negative and rising V+ = + 1 (2) For Vs positive and decreasing V+ = + 1(3) For Vs decreasing through zero value V+ = + 1 (4) For Vs increasing though zero value V+ = + 1 Of these statements, the true statements are

• A. 1 and 3
• B. 2 and 3
• C. 1 and 4
• D. None of these statements