Consider the following expression.

$2 y+5 x+1$



Select all of the true statements below.

• 1 is a constant.
  
• $2 y$ is a coefficient.
  
• $2 y+5 x+1$ is written as a sum of three terms.
  
• $2 y$ and 1 are like terms.
  
• $2 y$ is a factor.
  
• None of these are true.