Computer Science Scala questions about tail recurision. Please help, I will give thumb up!

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We will define the following grammar: The start symbol is A. Which of the following terms can be generated by the grammar? Select one or more: a. b. H(H(LH(HY)))) c. HILM) d. e. g. H( H(Y)) Consider the grammar below. Which of the following is the correct definition in scala? Select one: sealed trait A sealed trait B case class ) extends B case class H(a: A) extends B case class YO extends A case class L(a: A) extends A b. sealed trait A sealed trait B case class ) extends A case class H(a: A) extends A case class YO extends B case class L(a: A) extends B C. sealed trait A sealed trait B case class ) extends A case class H(b: B) extends A case class YO extends B case class L(a: A) extends B d. sealed trait A case class ) extends A case class H(a: A) extends A case class YO extends A case class L(a: A) extends A Consider the grammar Complete the scala definition by dragging and dropping appropriate choices sealed trait A sealed trait case object Z extends case class S case class T case object extends B Complete the terms below so that they are generated by the grammar with start symbol A 1. STZ) Z)),Y) C.A extends A b:B a1:A, a2: A a:A,b:B extends B class Y a:A class Z a: A b: B, c:C