विधेय तर्कशास्त्र में निम्नलिखित में से कौन सी एक प्रतिज्ञप्ति है?
A(x)(f_x ⊃ G_x)
B(∃_x)(f_a · G_x)
C(∃_x)(f_y · G_x)
D(x)(f_x ⊃ G_x)
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