Which approach is more effective Antibody levels (titers) are shown below as a result of the respective vaccine approach

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Which approach is more effective
Antibody levels (titers) are shown below as a result of
the respective vaccine approach. Antibodies are produced as a
result of both innate and adaptive responses being active (needed
to prevent viral infections).
Question:
You collect blood from a patient with flu-like symptoms.
The serum was analyzed and shows antibodies specific to SARS-Cov2.
These antibodies are only of the IgM class.
Explain why these data reveal where this patient is
their response to SARS-Cov2. Include cell names and signal numbers
in the explanation.