:Boolean algebra manipulates

a$.$ logical variables

b$.$ arithmetic variables

c$.$ text variables

Boolean function contains

a$.$ one variable

b$.$ at least one variable

c$.$ at least two variables

In Boolean function, the common operators are

a$.$ NOT

b$.$ AND

c$.$ OR

d$.$ all the above

$?$Which of the following operation has the last precedence

a$.$ NOT

b$.$ AND

c$.$ OR

d$.$ all the above