A successful authentication attempt by a RADIUS server does not supply a username to the JUNOS software. Which username is used by default？（）

A BGP router has the following configuration： 
protocols{ 
bgp{ 
export[policy-1 policy-2 policy-3]； 
}} 
policy-options{ 
policy-statementpolicy-2 { 
termget-statics{ 
fromprotocol static； 
thenaccept； 
} 
termreject-all { 
thenreject； 
} 
} 
policy-statementpolicy-1 { 
termget-aggregate { 
fromprotocol aggregate； 
thenaccept； 
} 
termreject-all { 
thenreject； 
} 
} 
policy-statementpolicy-3 { 
termget-ospf { 
fromprotocol ospf； 
thenaccept； 
} 
termreject-all { 
thenreject； 
} 
} 
}  
Which policy term is evaluated first when exporting routes？（）

Which action occurs when the BGP route 20.1.0.0/16 is evaluated by the policy expression？（）
[editpolicy-options] 
policy-statementreject_10 { 
from{ 
route-filter20.1.0.0/16orlongerM 
} 
then{ 
communityadd 90-1； 
accept 
}} 
policy-statementaccept_20 { 
from{ 
route-filter20.1.0.0/16orlongerM 
} 
then{ 
communityadd 100-1； 
reject； 
} 
} 
community100-1 members 100：1； 
community90-1 members 90：1 
[editprotocols] 
bgp{ 
groupebgp-group { 
neighbor172.16.201.1 { 
export（reject-10 && accept-20）； 
}}}

Which action occurs when the BGP route 20.1.0.0/16 is evaluated by the policy expression？（）
[editpolicy-options] 
policy-statementmy-filter { 
term-first{ 
from{ 
route-filter192.168.0.0/16orlongeraccept； 
route-filter 192.168.1.0/24 exact accept； 
route-filter 192.168.2.0/24 exact； 
} 
then{ 
metric10； 
accept； 
} 
termsecond { 
then{ 
metric20； 
accept； 
}} 
policy-statementmain { 
termchange-attributes 
from{ 
policymy-filter； 
} 
thenaccept； 
} 
termdefault { 
thenreject； 
}} 
[editprotocols] 
bgp{ 
exportmain； 
}