What follows is an opinion from a United States Court of Appeals. Your task is to identify the type of district court decision or judgment appealed from (i.e., the nature of the decision below in the district court).

Opinion:
DANZIGER v. CLARK, United States Marshal.
No. 12189.
United States Court of Appeals Ninth Circuit.
March 20, 1950.
A. Brigham Rose, Los Angeles, Cal., for appellant.
Ernest A. Tolin, U. S. Atty., Norman W. Neukom and Jack E. Hildreth, Asst. U. S. Attys., Los Angeles, Cal., for appellee.
Before DENMAN, Chief Judge, and STEPHENS and ORR, Circuit Judges.
PER CURIAM.
Appellee in this appeal in a habeas corpus proceeding moves to dismiss the appeal on the ground that the appellant is no longer in the custody of the appellee.
The affidavit offered on behalf of the appellee states that the sentence, claimed in the application for the writ of habeas corpus to have been illegally imposed, has been ■fully served and appellant’s counsel at the hearing asserted that his client was not in the custody of the appellee.
The motion to dismiss the appeal is granted.

Question: What is the type of district court decision or judgment appealed from (i.e., the nature of the decision below in the district court)?

Choices:
Trial (either jury or bench trial)
Injunction or denial of injunction or stay of injunction
Summary judgment or denial of summary judgment
Guilty plea or denial of motion to withdraw plea
Dismissal (include dismissal of petition for habeas corpus)
Appeals of post judgment orders (e.g., attorneys' fees, costs, damages, JNOV - judgment nothwithstanding the verdict)
Appeal of post settlement orders
Not a final judgment: interlocutory appeal
Not a final judgment: mandamus
Other (e.g., pre-trial orders, rulings on motions, directed verdicts) or could not determine nature of final judgment
Does not fit any of the above categories, but opinion mentions a "trial judge"
Not applicable (e.g., decision below was by a federal administrative agency, tax court)

Answer: 4