You are implementing a method named GetValidPhoneNumbers. The GetValidPhoneNumbers()
method processes a list of string values that represent phone numbers.
The GetValidPhoneNumbers() method must return only phone numbers that are in a valid format.
You need to implement the GetValidPhoneNumbers() method.
Which two code segments can you use to achieve this goal? (Each correct answer presents a
complete solution. Choose two.)

A.
Option A

B.
Option B

C.
Option C

D.
Option D

Explanation:
* Regex.Matches
Searches an input string for all occurrences of a regular expression and returns all the matches.
* MatchCollection
Represents the set of successful matches found by iteratively applying a regular expression pattern
to the input string.
The collection is immutable (read-only) and has no public constructor. The Regex.Matches method
returns a MatchCollection object.
* List<T>.Add Method
Adds an object to the end of the List<T>.