In the Electoral College, what formula was utilized to set the number of electors?

Select one:

a$.$ Equivalent to the number of members of Congress with equality of representation as derived from the House and proportionality of representation as derived from the Senate

b$.$ Equivalent to the number of members of Congress with equality of representation as derived from the Senate and proportionality of representation as derived from the House

c$.$ Equivalent to the number of members of the Supreme Court to ensure an absolute in$-$direct representation among the electors

d$.$ Equivalent to the number of members of the Senate but not the House to ensure an absolute equality in representation among the electors