Consider the following Java declarations $($assume classes People, Student and Worker as discussed in Example$3.$java$)$

People P$1=$ new People$("$Herbert$","1/1/2024")$;

People P$2=$ new Worker$("$Mortimer$","2/2/2000",100000)$;

People P$3=$ new Student$("$Abigail$","3/3/2005",$ "Data Science", $3\mathrm{.}5)$;

String S$1=$ new String$("$Margaret$")$;

Which Java expressions below are NOT legal? Indicate all expressions that are not legal.

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a P$1.$compareTo$($P$2)$

b P$1.$compareTo$($P$3)$

P$2.$compareTo$($P$3)$

d P$1.$compareTo$($S$1)$

e S$1.$compareTo$($P$1)$