Which of the following best describes the pathogenicity of E. coli and E. histolytica?a)Both E. coli and E. histolytica are nonpathogenic organisms.b) E. coli is pathogenic, while E. histolytica is nonpathogenic.c) E. coli is nonpathogenic, while E. histolytica is pathogenic.d) Both E. coli and E. histolytica are pathogenic organisms.