Which of the following is a subspace of the vector space P2 of all polynomials of degree at most 2? Select one or more: O a. The set of all polynomials of degree at most 1 O b. {ao +a1r + a2x2 E P2 :...

Extracted text: Which of the following is a subspace of the vector space P2 of all polynomials of degree at most 2? Select one or more: O a. The set of all polynomials of degree at most 1 O b. {ao +a1r + a2x2 E P2 : ao = 4} Oc. {ao +a1r + a2x E P2: a1 + a2 = 3} %3D d. {1+x+ x}