What is the output of the given code?

counter = 0
until counter >= 10
  puts counter
counter+=1 
  end

What is the keyword used to define a conditional statement in Ruby?

A. case

B. while

C. for

D. if

Which of the following loops in Ruby is executed at least once?

A. while

B. until

C. for

D. do...while

In Ruby, what does the unless keyword do?

A. Executes code if condition is true

B. Executes code if condition is false

C. Breaks out of loop if condition is true

D. Executes code only once if condition is true

What is the purpose of the case statement in Ruby?

A. To define a class

B. To handle multiple conditions with one expression

C. To declare a variable

D. To perform mathematical calculations