In which of the following cases did the Supreme Court tacitly approve (1) unfettered jury discretion in death sentencing, and (2) capital trials in which guilt and sentence were determined in one set of deliberations (instead of bifurcated proceedings)?

a. Furman v. Georgia, Jackson v. Georgia, and Branch v. Texas
b. Gregg v. Georgia, Jurek v. Texas, and Proffitt v. Florida
c. U. S. v. Jackson and Witherspoon v. Illinois
d. McGautha v. California and Crampton v. Ohio
e. none of the above