Which of the following is an obvious syntax error?

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a

Using an incorrect spelling for a variable name $($e$.$g$.,$ defining a variable as int programin; $)$

b

Using multiplication, instead of addition: $($e$.$g$.,$ a $=$ b$*$c; instead of a $=$ b$+$c;$)$

c

misspelling a keyword $($e$.$g$.,$ using print instead of printf$)$

d

None of these