Answer:
Option e is true
Step-by-step explanation:
Set:{x/x}
Least upper bound:
If a non empty set A and A has an upper bound.Then, the number c is least upper bound when it satisfied the following properties
1. for x belongs to A.
2.For all real number,if k is an upper bound for A then,
Greatest lower bound:
If a non empty set A and A has lower bound.Then, the number c is greatest lower bound when it satisfied the following properties
1. for x belongs to A.
2.For all real number,if k is lower bound for A then,
Least upper bound=2
Greatest lower bound=1