A combinational logic circuit has one output (F) and four inputs (a, b, c, and d). The circuit is described by the following Boolean expression. A static one hazard occurs when F = (a + b + c)(a +c+d)(b +c+d)(a +7 +d) abcd=1111 changed to 1101 abcd=0000 changed to 0010 abcd=1101 changed to 1111 abcd=1011 changed to 1101 abcd=1101 changed to 1011 abcd=1101 changed to 1110 abcd=1110 changed to 1101