2.7 Fill in the blanks in cich of the following statements: a) are used to document a program and improve its readability. b) A decision can be made in a Java program with a(n) c) The arithmetic operators with the same precedence as multiplication are. and d) When parentheses in an arithmetic expression are nested, the ses is cvaluated first. set of parenche- c) A location in the computer's memory that may contain different values at various times throughout the execution of a program is called a(n)