What is the difference between a and b?
var a: String? = "KotlinProgramming"
var b: String = 'KotlinProgramming"
var a: String? = "KotlinProgramming"
var b: String = 'KotlinProgramming"A. a is volatile as in Java
B. a is final and cannot be changed
C. b can never become null
D. b is final and cannot be changed
Answer: Option C
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