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Fields and methods in enum

Deciphering Java Enum Constructors

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Consider the following code snippet of a Java enum `TimeZone`:

public enum TimeZone {

  PST("Pacific Standard Time", -8),
  MST("Mountain Standard Time", -7),
  CST("Central Standard Time", -6),
  EST("Eastern Standard Time", -5);

  private final String desc;
  private final int offset;

  TimeZone(String desc, int offset) {
    this.desc = desc;
    this.offset = offset;
  }

  public String getDesc() {
    return desc;
  }

  public int getOffset() {
    return offset;
  }
}

Based on the understanding of enum in Java and the code snippet above, which of the following statements are correct?

Select one or more options from the list

The constructor `TimeZone(String desc, int offset)` can be invoked directly to create a new instance of `TimeZone`.

`TimeZone.CST` is an instance of an enum type `TimeZone` and it will have only one instance throughout JVM.

The enum constructor is called separately for each enum constant, at the time they are declared.

The `offset` field can be modified directly using something like `TimeZone.EST.offset = -4;`

`TimeZone.PST.getDesc()` will return the description of the timezone PST as `"Pacific Standard Time"`.

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