Which of the Following Statements Is/are True of Catalyst

Multiple Choice

Which of the following statements is/are true of catalyst?
1. A catalyst is a substance that speeds up a reaction without being consumed itself.
2. A heterogeneous catalyst is one that is present in the same phase (physical state) as the reacting molecules.
3. A homogeneous catalyst is one that is present in a different phase (physical state) from the reacting molecules.

A) ​1 only
B) ​2 only
C) ​3 only
D) ​1 and 2
E) ​2 and 3