Read the following excerpt from a US court opinion:
```
262 F.3d 677, 679 (8th Cir.2001); Larry’s United Super, Inc., v. Werries, 253 F.3d 1083, 1085 (8th Cir.2001); Keymer v. Mgmt. Recruiters Int’l, Inc., 169 F.3d 501, 504 (8th Cir.1999). Under the first part, the court must ascertain whether a valid agreement to arbitrate exists between the parties. Gannon, 262 F.3d at 679. The court next determines whether the specific dispute falls within the scope of that valid agreement. Id. If the court answers these inquiries in the affirmative, under sections three and four of the FAA, the court must stay proceedings and compel the parties to submit their dispute to arbitration. Lyster v. Ryan’s Family Steak Houses, 239 F.3d 943, 945 (8th Cir.2001) (citing Dean Witter Reynolds, Inc. v. Byrd, 470 U.S. 213, 218, 105 S.Ct. 1238, 84 L.Ed.2d 158 (1985) ; Telectronics Pacing Sys., Inc. v. Guidant
```
What is the most suitable continuation to the opinion? Your options are:
A. holding that the faa mandates courts to direct parties to arbitration on issues to which a valid arbitration agreement has been signed
B. holding that the faa requires arbitration of age discrimination claims when a valid arbitration agreement exists
C. holding that the federal arbitration act requires piecemeal resolution when necessary to give effect to an arbitration agreement and mandates enforcement of an arbitration agreement notwithstanding the presence of other persons who are parties to the underlying dispute but not to the arbitration agreement emphasis added
D. holding that faa was inapplicable where parties involved in action are not parties to an arbitration agreement under which issues are referable to arbitration
E. holding that in ruling on a motion to compel arbitration a court must consider 1 whether the parties have entered into a valid arbitration agreement 2 whether an arbitrable issue exists and 3 whether the right to arbitration has been waived
Reply with [A, B, C, D, E] only.