In the Following Sample Document Data (Presented in MongoDB Syntax),how

In the following sample document data (presented in MongoDB syntax) ,how many documents are there? {
_id: "Advisor1",
Name: "Shire,Robert",
Dept: "History",
YearHired: 1975
}
{
_id: 555667777,
Name: "Tierney,Doris",
Majors: ["Music","Spanish"],
Addresses: [
{
Street: "14510 NE 4th Street",
City: "Bellevue",
State: "WA",
Zip: "98005"
},
{
Street: "335 Aloha Street",
City: "Seattle",
State: "WA",
Zip: "98109"
}
],
AdvisorID: "Advisor1"
}

A) 2
B) 4
C) 6
D) 8